Here are the top few ways to get on my nerves:

#1: BECOME UNRELIABLE!

I cannot STAND people who back out on plans. For real. I'm a pretty laid-back guy most of the time, but I cannot stand it when people back out on plans. It aggravates me to no end. Do NOT make plans you cannot stick to! I have un-friended people over this pet peeve. This causes tons of problems to planners ... when you expect X people to attend, and then people back out. RSVP is for a reason!

#2: NEVER BE AVAILABLE!
If you're a friend, I would imagine that you should ... well.. hang out with your friends. I realize that some people are really busy with their lives, but I find it hard to believe that people cannot come out to events with their friends when asked. This specifically applies to guys who suddenly decide to immerse themselves with their studies and never be available to do anything regardless of how early we make plans (or how much we try to accomodate them)

#3: DON'T FINISH A JOKE
I really really really really cannot stand it when people start telling a joke or start talking about one and then won't finish it. Really. I get angry over this. It bothers me to no end. I don't care if the joke sucks, TELL IT TO ME. I NEED TO HEAR THE PUNCHLINE.

#4: TALKING IN MOVIES
I have paid $7.50 to watch a movie in silence. I don't care if you're having a baby girl or if your long-lost friend has called you on your cell phone. SHUT UP. I also hate it when people "shout" to the screen during the movie. Idiot, they can't hear you. Clapping and talking during credits is ok.