When i was still playing wow i seen it 4 times total (vanila till pandaland).
I got contacted in person once i crashed kazzak server due to the event we made. There werent mad or anything, they only asked me to inform them next time so they add more server cap.
And one that i remember in tbc is when one of my friends had some issue with character and gm turned us into...cant remember what it was realy, it was so looong ago.