What I love about price discrimination is that sometimes you have to think through a few steps to figure out who the target demographics are, which makes it a sort of game for me. Sometimes it's obvious (senior discounts), but often it's a little more indirect. One of my favorites: I drive a diesel, and every Monday Shell sells their diesel at a discount of $0.10/gal. I figure that they're trying to discriminate between businesses (the overwhelming majority of diesel drivers in the U.S.) and individuals: a long-haul trucker has to buy gas right when he needs it, and probably can't just put it off until Monday; I typically use slightly more than half a tank of gas each week, so I rarely need gas so badly that I can't put it off until Monday.