People who buy 24 packs of bottled water. Then just toss the bottles in the trash when they are done. Then repeat the process every time they run out. Get ONE water bottle, and fill it up with water. Crap.
When the sprinklers come on right after it rains, or come on during the rain. Actually, sprinklers in general. I see no real need for a fancy green lawn. It's wasting our water. The ground should be watered naturally, through the rain. If it's all dried up and weeds... well that's the way it was meant to be.
People who make fun of others for being vegetarian. Shirts like... meat is murder. tasty, tasty murder. PETA = people eating tasty animals. Something about that, just drives me absolutely crazy. I don't know why they find it necessary to point out that they are meat eaters, and think it's funny to put those who don't, down.
People who walk slowly through the isles, just kind of, looking around... not really doing anything. Gazing off into the distance... their cart is on one side and they are on the other. Then they stop, think, and then slowly continue.
People who take a fully loaded cart into the self check out lane. I know, there is technically no limit. But self check out lanes are for people who want to get in, and out, quickly. So please go into a normal lane.
I could probably go on forever, but it's probably not good to show how easily I can get annoyed... haha.