I found a really fun glitch with my mage, but they have fixed it. I
used to be able to polymorph a critter such as a cow, rat, chicken, etc
and turn it into a sheep. When I killed an enemy or animal in 1 hit
while polymorphed, it would die in its polymorph state. So you would
have a dead sheep laying on the ground labeled COW.
I thought I would have some fun with this so I went off to Ironforge and sat my mage in the tram. I then sheeped and killed rat after rat as they respawned. Before you knew it, there was a whole herd of dead sheep at my feet, all labeled RAT. When people walked into the tram station they would just stop and stare at me for a while and often ask WHAT HAPPENED?!? It was great fun until Blizzard fixed the glitch.