I've got a little list.....
On the road, people: who don't at least signal before abruptly jumping over into your lane; who don't (especially at a 4-way stop) signal whether they're going to turn, or go straight; who have no idea what the words right of way mean; who, while driving, are trying to apply their mascara, put on their bra (no, really! I've seen it!), reprogram their radio, read the paper (or a book), or turn to talk to people in the back seat.
People who think it's a laugh riot: to deliberately soil public restrooms so as to make them unusable by other people; to drop things off of overpasses onto traffic passing beneath; to steal street signs.
People who think it's acceptable behavior to change their baby, and then dump the nasty, stinky diaper in the parking lot, or to tuck it behind the merchandise on the shelf in a grocery store, or (even better yet!) who first rip into a bag of diapers on the shelf, steal a diaper, change their baby, then tuck the soiled diaper into the opened bag, and put the bag right back on the shelf where they got it.
(Can anyone guess that I used to work in a grocery store?)
People who think that public places are the place to have an extended scream at their kids.
Plus a whole array of the more commonly-found spelling errors; our/are, they're/their/there, yada yada.
People who think there is such a thing as A phenomena. It's plural. Plural, plural, plural!
Telemarketers who don't know how to take "no, thank you!" for an answer.
People who won't quit trying to convert me to their religion. No, really; if I find that, for whatever reason, I need to be preached to, I know where to find it. For that matter, people who are convinced that their particular denomination is the One True Religion, and their god is the One True God; all others are lies and deceptions.
(Okay, stopping now. Slow breaths.....)