So wrong, yet so right! Chris Pratt and Jimmy Fallon belted out some tunes during The Tonight Show on Friday, April 25 — with a silly catch! The duo played a round of "nonsense karaoke," which replaced the songs actual lyrics with, well, nonsense.

The Jurassic World actor started it off with Mark Ronson and Bruno Mars' ever-so catchy hit "Uptown Funk." Fallon, of course, couldn't help but jump in for a hilarious duet.

"Arm pit is ice cold / Egg shell diaper, that's quite old / This one, for them drunk squirrels / Them drunk squirrels love Aspercreme," Pratt sings. "Cryin' while you snuggle it up with a kitty."

Anna Faris' love and the late-night host, 40, continued to make the audience laugh with renditions of Sam Smith's "Stay With Me" and Kelly Clarkson's "Since You've Been Gone."

Watch the funny video!