Julia Roberts and Jimmy Fallon

Julia Roberts took several balls to the face on Thursday.

During the actress' appearance on The Tonight ShowJimmy Fallon invited her to play a game of "Face Balls." The rules are simple: Roberts and Fallon take turns throwing balls at each other's faces. Footage of the impact is then shown in slow motion. Laughter ensues.

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"There are so many jokes, it's giving me a headache," Roberts bewailed, before continuing her dirty quips. "This is like the comedy version of Fifty Shades of Grey."