"Night at the hotel" joke

A blonde at the front desk of a hotel checks in and tells the manager she's only staying for one night. She pays the manager, gets a room key, and heads upstairs.
Later throughout that night, guests call the front desk complaining that a blonde woman had been walking into their rooms, eating their food, using their bathrooms, sleeping on their beds and watching tv. The manager immediately knows who the culprit is and calls the blonde woman who had checked in earlier.
When she comes downstairs the manager says, "
Look ma'am, the other guests don't appreciate you walking into their rooms and using their stuff. I would like to ask you to stop."
The blonde looks totally confused. "
But I don't understand. It's what I paid for isn't it?"
Now it was the manager's turn to be confused. "
Ma'am, what are you talking about?"
"
Well,"
the blonde says, "
your sign out front said 'All Rooms are 50 Dollars.' And I paid 50 dollars."