African Dwarf frogs, play dead. Not only do they play dead, they play LEAF at the same time. Check out this video:
Katrina and I got one. When they aren’t moving, they are rigid, so they behave just like a leaf as they go with they coast in the water. They also breath at the surface, so they constantly swim up and down inside a tank. My favorite thing, is when they are positivly boyant, and float to the top of the tank spread eagle. Katrina calls it a “backwards base jumper”. Here’s a video of him doing it: