Tell me that genie joke?

a man finds a lamp on the beach and he rubs it . A genie pops out and says "i will grant you three wishes but there is a catch. What ever you wish for your wife gets double and after the wishes are granted she will file for divorce". The man says "Okay I can live with that. My first wish is to own a really expensive sports car".The genie nods his head and says "wish granted You have 1 expensive sports car and your wife has 2" The man says "Okay now I want 6 million dollars". The genie nods his head and says "wish granted. Your wife now has 12 million dollars." The man pauses and thinks really hard. The genie just sits there. The man"s face suddenly bursts into a grin. The genie asks "have you come up with your third wish?" The man nods and says "I wish for a mild heart-attack"