(My brother told me this one, I hope he didn't get it off here. I assume he didn't because I haven't seen it.)
A man walks into a bar and asks for a beer. The bartender hands it to him and says "that'll be one cent please."
The man thinks "Wow, that's really cheap" and decides to order a t-bone steak, with mashed potatoes and gravy.
The bartender says "that'll be four cents please."
The man is even more surprised and asks the bartender "where is the manager for this place?"
The bartender replies "upstairs with my wife."
"What's he doing upstairs with your wife?"
"The same thing I'm doing to his business."