A tired traveller pulls into a hotel around midnight.

A tired traveller 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 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."