Well I'm on a RP server myself and when one of our raiders accidentally DE'd a wrong item, the GM came personally as well. Then he summoned El Pollo Grande in front of BT, naturally.
Then we have a chat, and he starts saying "Well, I have to be off now. Give Illidan my regards. I hate this place and will not enter it.
Me: "You're only saying that because ... you are not prepared!!!"
GM: "Oh, I am." (grows five times, turns red and starts breathing fire all over. Shrinks back to normal) "Are you?"
And a few more tnighs like that. GM's can be fun.
I do remember a mage saying that after a resolved issue his GM would end his goodbye sentence with "...and may your sheep always stay fluffy!"-