I thought griefing was just yeah, being an annoyance
Like those guys in TF2 that get stuck in the doors and prevent people from going out and harass them on mic
I kinda like watching it, and if it happened to me, I'd just leave and play elsewhere. I don't get particularily involved ever, so just switching games wouldn't be too harsh. Idk how I'd feel if I was one of those super clan members whatever doing the MATCH OF THE CENTURY and then a griefer got us all stuck in the spawn room, but then again, that would be on some private server and if there'd be a griefer, he'd just get kicked out..
Actually, source games mic harassment is the best griefing ever
This is proof:
http://www.youtube.com/watch?v=ifgggspJ7jM