If you're going to be a guest on The Tonight Show Starring Jimmy Fallon , you should know by now that he's going to make you do something weird. Having said that, I don't know if Julia Roberts  anticipated that Fallon was going to toss a bunch of giant transparent plastic balls in her face and replay it back in slow motion to the audience. It's his latest game, cleverly called Face Balls, and it's so simple . . . yet so genius. You have to give the man some credit for being willing to throw anything at all in the face of America's sweetheart. The video is pretty funny, check it out below.