I have this vague recollection of a TV commercial 20 or 30 years ago in which a credit card was used to test the closeness of a shave by holding the card more or less perpendicular to the face and scraping the edge of the card along the cheek against the grain. The idea was that if it didn't make much noise, it was a close shave. I think it was an ad for Remington electric shavers, but I'm not sure. Anyone else remember that?