Dean relaxes in Houses of the Holy.
Dean: Did you bring quarters?
Sam: Dude, I'm not enabling your sick habit. You're like one of those lab rats that pushes the pleasure button instead of the food button until it dies.
Dean: What're you talking about? I eat.
– Dean and Sam Winchester, 2.13 Houses of the Holy
Magic Fingers is the brand name of a bed relaxation system that makes the mattress vibrate. Dean is very, very fond of it, and delighted when he encounters it in various motels. It is mentioned by Dean in many episodes as a favorite form of relaxation, usually paired with some Casa Erotica or a copy of Busty Asian Beauties.
When the inventor of the Magic Fingers died in June 2009, it was noted throughout fandom, and reported in the Spnnewsletter.
Dean is forced to stay in while Sam investigates their current case. Dean spends his time lying on the bed, letting the Magic Fingers "do their work." When Dean runs out of quarters to feed the automat, Sam isn't sympathetic.
Dean notes with delight that there's a Magic Fingers automat in the motel they check into. While Richie is talking about Trotter, Dean loads a quarter into the slot.
Dean mentions to Amanda Heckerling that he's staying at the local motel, The Pines, which features HBO, free ice, and Magic Fingers.
Dean indulges in the Magic Fingers while babysitting baby shapeshifter Bobby John in the motel.
Mary tells Dean her current plans are "pay-per-view, Magic Fingers, the uze" when he calls her about going on a hunt with them.
Annoyed by their search for Gabriel, Dean kicks the bed in his and Sam's motel room and is delighted to learn it vibrates without the need of a quarter. He calls it a "bonus."