Who's kid???

A couple wants a divorce, but first they must decide who will be the main guardian of their child. The jury asks both the man and woman for a reason why they should be the one to keep the child. So the jury asks the woman first. She says, "Well I carried this child around in my stomach for nine months and I had to go through a painful birth process, this is my child and apart of me." The jury is impressed and then turns to ask the man the same question. The man replies, "OK, I take a coin and put it in the drink machine and a drink comes out, now tell me who does the drink belong to me or the machine"