One of My favourite times is probably on the warhammer server when I first became Major Stern. Major Misfire (My prev character) was pjed by falling off a bridge while singing a cadence so we all tried to do the 22 gun salute and then I ran about 10 guardsmen through extreme PT and we were marching and cadences and even the shrek song and we all just started singing random stuff.
Another is when I took all the guardsmen on a "Stealth" mission and we spied on Murlock and the catachan for a little bit until he flew up to me in no clip and killed me. Then that started an all out war with catachan and 512 and even some space marines joined it