I hate being stiffed by friends on money owed, even if it's just a piddly amount, such as $5-$10. It's not the money I get upset about, just the idea that they wouldn't pay back what they owe.
Ooooh...this is me, too! I am always scrupulous if I owe anyone anything, even it's just 5 cents. So I really hate it when people don't accord me the same courtesy. Like you said, it's not the money, just the principle of it.
Yes, I hate that as well. Along the same lines, I hate when people 'borrow' something and never give it back. Often when you approach them about it later, they misplaced it (not that I should even have to track down people to get my stuff back in the first place).
Some other pet peeves:
*when somebody calls your home and says 'is so and so there?' without even a simple 'hello'
*kiosks in the mall that have sales people who will stand in front of you to try to get you to buy something. If I am interested in buying what you have to sell, I will come to you.
*people who talk about attributes of the opposite sex in mixed company. An example is when I was dining out in a group (mostly girls) and one girl goes on about 'hot' guys. I could tell one guy there who didn't know most of us very well and wasn't your typical 'hot' guy was uncomfortable. Guys are known to do this too.
*people who leave heavy weights on the machines at the gym
*being called ma'am. I'm 30 and often get asked if I'm still in school so I assume I look fairly young. I've always assiciated ma'am with meaning 'older woman'
*really casual clothes worn in any type of sit down restaurant. Yes, the woman in the Olive garden with shorts over a bathing suit, I'm refering to you.
*seeing litter because it is lazy and rude to everyone to litter