1. Loud, screaming, unruly children.
2. People with a job to do–that they aren't doing–which causes me to not be able to do what I need to do.
3. Sarcastic people.
How do I react?
2. Do everything myself, rather than wait on them to get their act together.
3. Respond with a withering, disgusted look and put that person on my shit-list. (I think sarcasm is rude, and I don't have any use for rude people.)