My only really big celebration:
a lan game of Dystopia on a map mad eby one of my friends. I capture the second cyberspace objective seconds before the door behind me opens and the entire enemy team consisting of Light players storm in and pin me to the wall with massed boltgun fire, leaving me hanging there like some kind of macabre satanic sacrifice.
A split second later, a missile fired by one of my teammates explodes in their midst, killing EVERY SINGLE ONE OF THEM and sending their scattered gibs bouncing all over the room to lay at the feet of my crucified character
I push by seat back, throw my hands in the air and yell "oh YEAH!!!! WOOOOOOOH!!!!!" and start laughing.