A man stumbled upon a Djinn in a bottle.
The Djinn said: “I fullfill you every wish but whatever you wish for your wife gets double of the same thing”
So the man wishes for 1000 € the wife gets 2000. He wishes for a new car the wife gets two new cars etc etc.
When the man meets the Djinn the next time his request is:
“Please beat me half to death!”