Jim, a traveling salesman goes to a hotel late in the night and asks the clerk for a single room.
As the clerk is completing the formalities, Jim looks around and finds a stunning blonde seated in the lobby. He tells the clerk to excuse him for a moment and heads to the lobby. He is back in a minute with the blonde on his arm.
“Fancy running into my wife here,” he tells the clerk. “Guess I’ll need a double room after all.”
Next morning, when Jim comes to settle his bill, he finds the amount to be $4200. “What the hell is this?” he yells at the clerk. “I have been here for just a night!”
“You are right, Sir,” says the clerk, “but your wife has been here for 4 weeks.”