Sorry, very long read, and forgive me; I've grown to be a fairly bitter person...
Airplane landing - All those that stand up immediately upon landing, no matter what row they are in. Guess what? You're not going to magically disembark first if you're in row 30..
Highway driving - When I'm driving/passing in the left lane, those in the right lane that decide they need to cut in front of you at the last second, and then proceed to drive very slowly. I guess they couldn't wait that extra 5 seconds to let you pass.
General Driving - Please use your turn signal. That's it. Thank you.
Ames stoplights - Yikes. You'd think with the DoT headquarters in Ames, this would be better. It is not.
Cellphones/swerving/driving/etc - You're in a 2 ton or more vehicle. Pay attention. Also, for those that can't stay in the right lane whilst I'm passing in the left lane...Your random texts and facebook postings, etc, aren't very important in the grand-scheme of things. Please pay attention. Humorously, (to myself, anyway) I had my 3-year old daugher automatically says "get off your phone" all the time to other cars when I'm driving.
My Wife - If I've answered every single "what do you want for dinner?" with somethign like "Doesn't matter; I'll eat whatever you give me", it literally means...It doesn't matter; I'll eat whatever you give me.
Work/Being wrong - If you mess up/didn't know something, that's fine -- just say it; don't try to come up with some bs excuse. Work isn't going to fire you. I catch people doing this all the time.
Yardwork - I mean, yeah, I'm lazy, but I try to work on cleaning up most of my leaves in the Fall. My neighbors do not..Consequently, I get a lot of leaves in my yard.
Crowds - So full of rude people/people without manners, in general.
Left-Lane - If you're not passing, get out of it. It's not your personal driving lane.
Barking Dogs - I love animals. However, I do not love animal owners who don't give a damn what their animals do.