I'm playing white and about to lose. Villain is a total nit:
when I play
Bg4!!
I immediately act like I didn't see the knight and try to pull the bishop back. Villain insists "You took your hand off! You have to leave it there!" I groan in disgust, say "[censored] you, man" and leave the bishop. Villain immediately plays
... Nxg4??? [1]
for the stalemate.
Beat: I didn't win. Also, I suck at chess.
Brag: I trapped him!!
Variance: Villain is a chess coach, despite the fact that he's not much better than me.
[1] ??? means that villain is dumber than a bag of stupid.