Actor Chris Pratt and Jimmy Fallon did a Christmas-themed Mad Libs Theater sketch on The Tonight Show Starring Jimmy Fallon on Tuesday, Dec. 6.

During Pratt's appearance on the show to promote his new movie Passengers, Fallon asked the actor to answer some questions and then they would perform some skits together. In the Mad Libs sketch, Pratt plays Santa who accuses his elf Ding-Dongs, played by Fallon, of stealing Christmas gifts.

Pratt asked Fallon, “Where were you the night before Christmas?” Fallon responded by saying, “I was with Pickles. We were listening to The Roots holiday album and making snow gerbils.”

The Jurassic World star replied to that by saying, “Then why did Rudolph see you spanking on the roof?” and “The reason I work so hard is because I get to spread joy to millions of people and go sit by the fire shaking my nad.”

Fallon continuously broke into laughter throughout the sketch. Pratt also laughed but he tried to hide it.

You can watch the hilarious skit below: