The singer was in the midst of a basketball shooting contest with Fallon, where they used random objects instead of a ball.

The singer and Fallon were shooting hoops using inanimate objects, including a mannequin head, when Bieber — and his mouth — got a little sidetracked.

Prior to the contest, the performer spoke to Fallon about hanging out with pals Lil Za and Lil Twist, why he’s always getting stopped by the police, and “being responsible.”