Clients who make you do all kinds of custom work for you... only to change their minds 6 months later and expect you to be able to undo it all in thirty seconds.
People who ask you to do
something and give you very little information. Then berate you later because you didn't know what they didn't tell you.
Clients who have 64,000 people working on one project. Who all email you 800 times a day asking the same questions over and over until they get the answer they want.
Snarky work-related emails.
People who send you nasti-grams ... then when you call to clear up any miscommunications they don't answer and send you another nasti-gram saying you need to get on the same page.
Drivers who panic-brake. (Brake constantly on the road every time the wind blows.) Do they realize that letting up on the gas has the same effect?
People who say, "it is what it is." Really? Thanks captain obvious.
Staying in hotels just for the fun of it.
Dark nail polish.
Fresh flowers in bright colors.