A guy walks into a bar and asks for a beer.

The bartender tells him it will cost 10 cents.

After the guy finishes his beer he asks for a steak and another beer.

The bartender tells him it will cost 50 cents.

The guy pays and asks to thank the manager.

The bartender tells him, his boss it upstair will his girlfriend.

The guy asks the bartender "What's your boss doing upstairs with your girlfriend?"

The bartender repleys, "Probably the same thing I'm doing to his business"