1) People who are well aware that they have lost a debate, are hypocrites yet continue to increase their hypocrisy in hopes to win the debate.
2) People whose stupidity reigns supreme and every time they try to lower it, they end up showing their stupidity and infantile behaviors.
3) Attention seekers who never cease their attention-seeking even when everyone in the area has given it to them.
4) When you say something that you want to do or just suggest that goes against someone else's morals or beliefs and consequently, rather than accept what you want to do, they try to tell you that you don't want to do that. Their reasons are usually that "they know you" but usually it is because of their narrow-mindedness.
5) Waiting to sign up for my university courses for September and since we have an incredibly annoying and rather stupid system, the fourth years grabbed three courses I wanted (only 2 were ones from a list for one of my majors). For the ones they didn't fill up, they kindly put enough pressure on it so there's very few spots left.