I was there in the away end in January 2008 when a lad on the second tier at Bramall Lane let a load of balloons off as City and Sheffield United came out for the FA Cup 3rd round under Sven. And rather than pop them, like any sensible person would have done, Richard Dunne, Michael Ball, a young Joe Hart, etc. just let them drift around the City penalty area until Sheffield United scored two goals directly as a result of our lads not knowing the difference between a ball and a balloon and knocked us out of the cup.
Also, a home game against Hull around 2008, 2009. Down by the right corner flag where the Colin Bell Stand meets the South Stand, a City player and a Hull player - who I think was Paul McShane - went into a tackle and McShane ended up on the floor. Instead of just getting up like a normal person he decided to try catapulting himself off the floor by (sort of) body-popping? He just flipped into the air and slammed back down on his front. He got a load of sarcastic cheers from the City fans who couldn't believe what they'd just seen.
Not the only one who remembers: