Actually, this is really funny. I just spent the better part of two days trying to remember what the hell they called those things. I bought a shirt while in Jamaica that changes colors in the sun, and was trying to explain to my wife why I thought it was cool. You know, a throwback to high school thing. But I just couldn't remember what they were called. MMMMmmmmm. I'm going to go find one now.

Oh, and the ones that were a solid color were cooler than the tie dyed ones.