A few years ago when we were in California, our rental car didn't have a registration and we got a ticket. The rental company, I forget which one, said that it wasn't a problem but we'd need to let the worker at the desk know and give them a copy of the ticket.
No problem.
Except that our flight was at 6 AM, and the rental company was closed from 11 PM to 6 AM.
So, we figured, we'll get to the airport (John Wayne in Orange CA) just before 11 PM, get through security, and sleep at the terminal.
Who knew that John Wayne closes up shop at 10PM? We turned the car in, went into the airport, and had to sit out in the lobby in front of the closed ticket counters all night. Not a comfortable chair to be found.