Michael J. Fox

When Michael J. Fox describes his experience with Parkinson's disease in his new documentary, he's extremely blunt. But talking with NPR this week, he hasn't lost the humor that made him famous.

The "Family Ties" star was diagnosed with early onset Parkinson's disease in 1991. He says that if he doesn't know if he can do something, he fakes it — a strategy that works 80 percent of the time.