An eagle swoops down from the sky and eats a mouse.
Some time later, while the eagle is flying, the mouse sticks its head out of the eagle’s butt and asks, “How high up are we?”
“About 2,000 feet, “the eagle replies.
The mouse replies, “You ain’t shittin’ me, are you?”
This joke is included in the Black Book of Jokes. You can order it from here.