I always buy popcorn at the theater. Yes, it's expensive ... but so is going to the theater, period. It's part of the whole experience. If you're going to blow $25 to see a movie, might as well blow another $15 on popcorn and a soda. But, we do it like once a year.

I will sometimes buy bottled water, if I'm in town and really thirsty. But at home, the tap is fine for me. Hasn't killed us yet.

College textbooks ... true. But again, you're paying tens of thousands of dollars for that education, what's a few hundred more for books? And a college education more than pays for itself.

Printer ink ... I buy the refill kits. Cheap, but messy.

Designer clothes - never. Unless I find them at a thrift store or yard sale. Silly.