Wife
A tired traveler pulls into a hotel around midnight. Very tired after a long day's trip he asks the clerk for a single room. As the clerk fills out the paperwork, the man notices a gorgeous woman 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.
Lying to the hotel clerk, he says, "Fancy meeting my 'wife' here. I'll need a double room for the night."
The 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 for one night!"
"Yes," says the clerk, "but your 'wife' has been here for three weeks!"