What pisses you off the most?

There are many things that piss each and every one of us the most, right? For the most of time, it's just plain annoying to have them happening right under our nose. If you ask me, well, here are some of stuffs that irritate me to the point I just feel like want to kill someone.

(list are not in order)

• Parents who don't understand my interests.
• Mobile phone users who always turn their ringing tone volume too loud.
• Traffic jam.
• My classmates. Why? They always turn up the volume of the music player every time they use a PC in the working lab (well, at least, in my place). Sometimes, they don't even care of other students who happen to be there.
  
• Writer's block. Yes, I'm a writer and currently I'm writing a novel for this Pan-Asia anime competition. Damn, I don't like it when troubles come across my work.
  
• Show-offs (like new batch of students in the college I'm attending; they always bring their brand-new laptop to classes, and that piss me off. What a show-off!)
• Reality TV shows, especially the one called "Akademi Fantasia". Surprise? "The students need your attention"? Harsh comments? Angry fans?

LOL I wish I could do "THIS IS SPARTAAAAAAA!!!!!!" kick.