Three guys, a physicist, a mathematician, and an engineer were out in the woods on a scouting expedition. When all of a sudden, something quickly began to run through the brush.
The physicist observed that it behaved in a deer-like manner, so it must be a deer.
The mathematician asked the physicist what it was, thereby reducing it to a previously solved problem.
The engineer was in the woods to hunt deer. Therefore, it was a deer.
