Source: YouTube

Michael J. Fox was a guest speaker at a Back to the Future fan convention in Philadelphia yesterday (Sunday) and gave attendees a scare when he stumbled and fell on stage.

The 61-year-old actor was joined by his costars Christopher Lloyd and Tom Wilson for a Q-and-A session. As Fox walked across the stage, he suddenly fell and fortunately landed on a couch. He was uninjured and continued taking fans’ questions. Fox, who has been battling Parkinson’s disease for over 30 years, recently shared that his condition has gotten worse and he worries a lot about falling.