OK, here's an astonomy related one.

An astronomer is on an exedition to Darkest Africa to observe a total eclipse of the sun when he's captured by cannibals. The eclipse is due the next day around noon. To gain his freedom he plans to pose aas a god and threaten to extinguish the sun if he's not released, but the timing has to be just right. So, in the few words of the cannibal's language he knows he asks his guard what time they plan to kill him.

The guard replies "Tradition has it that captives are to be killed when the sun reaches the highest poinat in the sky on the day after they're captured. Then they may be cooked and ready for the evening meal."

The astronomer thinks "Great, this should work perfectly."

Then the guard says, "But since everyone's so excited about it, in your case we're going to wait until after the eclipse."

__________________
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind." - William Thompson, 1st Baron Lord Kelvin

"If it was so, it might be, and if it were so, it would be, but as it isn't, it ain't. That's logic!" - Tweedledee

This isn't right. This isn't even wrong. - Wolfgang Pauli