Or brownies!
Johnrudy, the 14-16 year olds aren't into costumes because they think it's babyish. But somewhere around the senior year in high school, they get interested in costumes again. And in college it's a HUGE event. At Georgia Tech the kids I know plan elaborate costumes well in advance of Halloween and spend a bunch of money and/or time on them.
If you're in Atlanta (I don't know if they're in other cities), check out the costumes at Junkman's Daughter. They have an unbelievable collection of costumes, not the Wal-Mart type made of thin polyester fabric, but actual garments. You can find anything, from Dorothy of The Wizard of Oz, to a costume that resembles part of a male's anatomy. Gross!