How to Stop Worrying about Your Own Borrowing
A husband and his wife are about to fall asleep... when the man's eyes suddenly open wide. For three nights in a row he has been unable to sleep. The man gets up, walks around, has a cigarette.
The woman asks, "What's the problem, my dear?"
"A terrible problem! I owe a lot of money to a certain person but cannot give it back!"
"Well, call this person and say you cannot give the money back! Then it will be he who will be wide awake and you'll sleep calmly."