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.