Since I can't sleep thanks to my soon-to-be former roommate stomping around the entire fucking house for 20 minutes, I'll contribute.
People who say or write, "Personally, I..." It's redundant. If you say or write, "personally," I'm going to assume you're talking about yourself. :p
Loud people, especially when they're attempting to brag about material items to co-workers/anyone within earshot. A guy in my office is always talking about his new car, new this or that. I think to myself, "Tsk, tsk, he must have the tiniest penis."
Magazine subscriptions...we're in an Internet Age, yet it still takes three months to receive the first issue? Nevermind if you've changed your address. Pfft.
Losing money in a ticket machine and knowing the transit company won't do anything to fix it from happening again.
People who complain about their weight/eating habits, but then get McDonalds/Taco Time or other fast food for lunch.
People who make shit coffee at the office.
Nigerian scammers on Ebay who'll wait until the last second to bid on something, win and then you have to complain to Ebay to re-list for free. What a waste of fucking time.
It can't be mentioned enough, people who talk too much at shows. I don't care how much you paid for your ticket, if you're standing/sitting next to me and chattering on about random shit while someone's on stage performing, I will ask you to quiet down. Make me say it again and "fuck" will be added to the sentence.
People in office buildings who fuck up the toilet stalls. Where do these people live?!? Let me come over to your house and leave shit/blood/piss on the seat or half-flush the toilet leaving one log in the bowl.