Three insane men walk out of a mental hospital hoping to escape. The first…

Three insane men walk out of a mental hospital hoping to escape.
The first says, "If there's a high fence, we'll dig under it!"
The second says, "If there's a low fence, we'll jump over it!"
The third says, "Well, we're out of luck, boys - There is no fence," so instead they just went back to their rooms.