What do you do when you have legendary comedian, Bill Cosby, in studio? Have him walk a tightrope of course! Last night, Mr. Cosby made a guest appearance on the Tonight Show with Jimmy Fallon. Since the theme of the night was 'extreme sports', Fallon persuaded Bill to walk a tightrope across studio 6b. Before you get nervous, don't worry. It was actually just a line stretched across the floor of the studio. But Cosby's hilarious commentary and gregarious personality made it an entertaining segment none the less. The best part? When Jimmy jumped on his back and Bill did the rest of the walk with his eyes closed!

Watching the video, it's hard to believe that Bill Cosby is already 76! You'd never know it by the way he carried Fallon across the studio, making jokes all the while. Check out the video to see the entire segment for yourself!

Who's been your favorite guest since Fallon took over the Tonight Show? Tweet me, @DaniOnUS105!