Jerry: I don't understand. Do you have my reservation?  
Car Rental Assistant: We have your reservation, we just ran out of cars.  
Jerry: But the reservation keeps the car here, that's why you have the reservation!  
Car Rental Assistant: I think I know why we have reservations.  
Jerry: I don't think you do. You see, you know how to *take* the reservation, you just don't know how to *hold* the reservation. And that's really the most important part of the reservation: the holding. Anybody can just take them.