How Much Do You Want To Pay?

As i sit here considering "cheap grace" I had to chuckle as I remembered (as i do often) one of the best commercials ever to be made for TV.  This was an STP commercial when my oldest was born, so it's about 45 years ago.  The customer is talking to the mechanic, and he asks if he really NEEDS to add the STP to his tank.  The mechanic shrugs and concedes that, no, he doesn't HAVE to, but the STP isn't that expensive to add. So, the guy has a choice, and he informs the customer, "Pay me now, or pay me later."