ghost shrimp are known to be a bit suicidal. I have found them on top of the glass lid, baked under my compact flourescents.
^ Truth ^
Most of the time they don't climb out. The get to the surface, try to swim down and are met with a fish mouth, they snap back instinctively and shoot right out of the tank. I used to watch mine stick themselves on the glasstop and fall back in as the water that was holding them there dried up. (I so need a life)