One time I was being a dick to this really arrogant guy (who normally beat me, but that night I was able to get a few games off him).
He made a bad move he probably knew was bad too and I said:
"oh, just as I calculated... a draw...
no, I'm just kidding, one of us is definitely going to lose this"
And ok, this guy usually did stuff like sigh when you took too long to move, look at his watch, all this stuff. So that night I was making it a point to look away from the board after each of my moves. Like, really obvious, I'd move, then learn across the table on my elbow and stare at the wall to my left lol. I think the only reason I beat him is it got to him psychologically... and I usually don't do this (more like never actually) but like I said this guy...
Say wha...? You call that an outpost? Take that! Bam! Now what?! Where's that bishop goin' now, huh? Bam, pawn to d5. Yeah, now what? Do you mean kind of like that?