Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research

NEW YORK, NY - NOVEMBER 12: Michael J. Fox, Julianna Margulies and Matt Czuchry attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Michael J. Fox attends the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Michael J. Fox, Julianna Margulies and Matt Czuchry attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research

NEW YORK, NY - NOVEMBER 12: Jane Fallon and Ricky Gervais pose with Michael J. Fox and : Tracy Pollan at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Michael J. Fox and Matt Czuchry attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Rachel Ray and John M. Cusimano pose with Michael J. Fox and Tracy Pollan at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Rachel Ray and John M. Cusimano pose with Michael J. Fox and Tracy Pollan at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Michael J. Fox, Julianna Margulies and Matt Czuchry attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Sam Fox and Michael J. Fox attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Sam Fox and Michael J. Fox attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Sam Fox, Michael J. Fox, Lucy Fox and Sam Fox attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Michael J. Fox and Tracy Pollan attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox performs onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox performs onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Tracy Pollen, Michael J. Fox and Clark Greg attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Michael J. Fox and his children attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: Tracy Pollen, Michael J. Fox and Clark Greg attend the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox and Joan Jett perform onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox and Joan Jett perform onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox performs onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox and Joan Jett perform onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox speaks onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)

Michael J. Fox's "A Funny Thing Happened On The Way To Cure Parkinson's" Charity Benefit.

NEW YORK, NY - NOVEMBER 12: (EXCLUSIVE COVERAGE) Michael J. Fox performs onstage at the 2011 A Funny Thing Happened On The Way To Cure Parkinson's event at The Waldorf=Astoria on November 12, 2011 in New York City. (Photo by Mike Coppola/Getty Images for the Michael J. Fox Foundation for Parkinson's Research)