As if you we needed more proof “Word Sneak” is a great activia.

Jason Segel takes on a serious role in his new movie “The End of the Tour,” but on Wednesday, the guy couldn’t keep a straight face playing the “Tonight Show” game with Jimmy Fallon. The pair just kept cracking up while trying to sneak goofy words into a normal conversation. But Segel totally stole the segment with his creative use of “Gene Shalit.”

Shalit we watch?

“The Tonight Show Starring Jimmy Fallon” airs weeknights at 11:35 p.m. ET on NBC.

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