Pretty sure I remember this chant last season, after losing to Chelsea 8-0 and Spurs 4-0, Wigan then came and won 3-0 and we started chanting 'How shit must you be, you've only scored 3'. Don't think it lasted very long, most people had left and the ones still there were too depressed to even join in.
Another was Liverpool away, Marlon Harewood came on when 1-0 down and scored an overhead kick. We didn't have a proper chant for him at the time so when 'Du, du, du, Marlon F***ing Harewood' broke out it was pretty funny and continued through the rest of the game and outside the ground.
I liked the Ashley Young chant, Claret Ribbon when on a cup run, and the one for MON which started with 'When I was young, I had a dream..'
A not so good one was the 'Eduardo' chant at Arsenal but everyone joined in purely because of how angry it was making the Arsenal fans. They actually got up off their seats and started throwing their arms around, very aggressive that for Gooners.