Julia Roberts and Jimmy Fallon 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.

No child left behind: TV's history of orphans

"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."