A bloke finds a dirty old glass bottle while digging in the garden. Thinking it may be valuable he takes it inside to wash it.
To his surprise while drying the bottle a genie appears and proclaims, "Thank you master for freeing me from the bottle. To repay you I shall grant you three wishes but be aware whatever you wish for your ex wife will receive twofold"
Right away the man says "I wish for a grand mansion", the genie replies "Granted, but remember your ex wife receives 2 grand mansions"
The man agrees and makes his second wish "I wish for a top of the range sports car", the genie responds "Granted, but remember your ex wife receives 2 top of the range sports cars"
The man agrees then says "Those wishes were rather frivolous, I need a couple of days to think about my third wish if that's okay", the genie agrees to give him time to think then returns 2 days later.
The man says "I've thought about this very carefully" pauses for a moment before adding "I wish to donate a kidney"