(idea stolen from the DST and AKA forums)
What product have you bought that you wish never wasted your money on?
I bought expensive white eyeliner because I read in some magazine that white eyeliner makes you look more awake. Definitely needed for when I drag my happy ass into work on 3 hours of sleep. After trying it once, I realized that it looks horrid on me and I wasted $20 on the thing.
Oh, and Ruffles low fat chips (I think it was Ruffles...). They're bad. I don't know what cardboard tastes like but I'll assume it's the same as low fat chips.