A Bored Dolphin
A bored dolphin can come up with some pretty bizarre behaviors. A funny example is the summer at one oceanarium when all the dolphins went crazy for seeing if they could balance on the tops of the walls around their tanks. Usually they could, but sometimes they fell out onto the walkways around the paths, and the oceanarium workers had to get together and heave the dolphins back into the tanks. (We're talking about hoisting 400 slippery pounds over a waist-high wall.) When the workers saw dolphins jumping up to try to balance on the walls, they would yell at them to stop, but the dolphins found that even more entertaining.
-- Suan McCarthy, _Becoming a Tiger_ --