Fancy Meeting My Wife

A traveller pulls into a hotel around midnight and asks the clerk for a single room. As the clerk fills out the paperwork, the man looks around and sees a gorgeous blonde sitting in the lobby. He tells the clerk to wait while he disappears into the lobby.
After a minute he comes back, with the girl on his arm.

"Fancy meeting my wife here," he says to the clerk.
"Guess I'll need a double room for the night."

Next morning, he comes to settle his bill, and finds the amount to be over $3000.
"What's the meaning of this?" he yells at the clerk.
"I've only been here one night!"

"Yes," says the clerk, "but your wife has been here for three weeks."