Roy T.

A vet was showing a new hire the ropes at the city zoo. As they walked around the grounds, he would give pointers on the animals, their habitats and their feeding schedules. When they aproached the artic habitat, the vet pointed out one animal in particular. "You see that big one over there? You need to be extra carefull with him. He's very moody and mentally unstable, and is very unpredictable. We have to give him anti-psychotics in his food to keep him from attacking the other bears.: "Wow, this sounds terrible... What do you call this condition?" "Well, he's a bi-polar bear, of course!"