For one day. Your body is sleeping soundly for that day. You can do whatever you want. (You wake up one day as him. You freak out and then assume it is a dream. Then you see that this is too real to be one.)You cannot feel pain and whatever you do is real. If you kill yourself or die on that one day both of you die. What do you do that day?
I would have sex with Selena Gomez.