August 1, 2014 11:03 AM EDT

Tonight Show host Jimmy Fallon came up with a new game called “Face Balls” while Julia Roberts was on-set Thursday.

The premise is simple: you throw balls at a person’s face and then watch their reactions in slow motion. The results were hilarious.

“This is like the comedy version of Fifty Shades of Grey,” Roberts said to Fallon.

 

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