Fallon Can't Keep It Together During 'Mad Lib Theater' With Jon Hamm & Keri Russell

"We'll kindly come up and say, 'It's mariachi night.'"

You're probably aware at this point that Jimmy Fallon has a tough time keeping it together during sketches. (You've had 22 years to figure this out.)

It's nearly a guarantee that this is going to happen anytime he does "Mad Lib Theater" with a guest on The Tonight Show. This time, he did "Mad Lib Theater" with Jon Hamm and Keri Russell. It was just as hysterical as you might guess from the expression on Fallon's face while he was cracking up.

The sketch asks guests to do a Mad Libs-style fill-in-the-blank. Afterward, the team at the show puts their responses into a script on cue cards, and the guests act out a scene with Fallon based on their responses. It's absurd, stupid, and really damn hilarious. That's especially the case with this new one, because Hamm manages to never break, straight-facing his way through the pre-flight instructions on Aggggh Airlines. 

Watch the new segment above, or check out past editions with John Cena, Natalie Portman, or Tom Cruise

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Dustin Nelson is a Senior Staff Writer at Thrillist. Follow him @dlukenelson.