Watch Jimmy Fallon Stick His Finger in John Stamos’s Mouth on the Tonight Show

John Stamos appeared on The Tonight Show with Jimmy Fallon Monday night to promote his upcoming show Fuller House.

But the pair ended up reliving their awkward first meeting at a Paul McCartney gig, when Stamos was a bit too eager to shake Fallon’s hand and instead, “fish-hooked” Fallon in the mouth with his finger.

“Your thumb went in my mouth,” Fallon said. “I know for a fact it happened.”

The host proceeded to show the Grandfathered star exactly how it happened by reenacting the scene — complete with a finger right in Stamos’s mouth.