hehe, the panda joke is the shortest but i didn't get it at first. i googled and found another version. that one made more sense to me.
A panda walks into a café. He orders a sandwich, eats it, then draws a gun and fires two shots in the air.
"Why?" asks the confused waiter, as the panda makes towards the exit.
The panda produces a badly punctuated wildlife manual and tosses it over his shoulder.
"I'm a panda," he says at the door. "Look it up."
The waiter turns to the relevant entry and, sure enough, finds an explanation.
"Panda. Large black-and-white bear-like mammal, native to China. Eats, shoots and leaves.