Right now, it's littering, because I just saw some people throw trash out of their car when I was behind them in the Taco Bell drive-thru. I wanted to find out where they lived, then drive over there in the middle of the night, slash their tires, and spray-paint "LITTER BUG!" on their back window. Of course, I would never actually do that, because I'm too afraid of breaking the law, but I wanted to.

Under normal circumstances, my environmental pet peeve would be that my dad steadfastly refuses to believe in global warming--he says it's BS, which I think he says just because he works at a coal-burning power plant and admitting that global warming is real would mean accepting that he is partially responsible for screwing up the planet.