"You’re or your. They’re, there or their. Effect or affect. Two, too or to. A lot is right, ‘alot’ does not exist. Get them right."
OH GOD.
Every time I read a story that contains these kinds of errors, I twitch a little bit. Your and you're bugs me, but I'm used to it. Their, there, and they're; however, make me want to rip the computer in half.
Example:
Story/Comment/Etc: "Omg I love MCR! There so great!"
Me: :) pours lighter fluid over the monitor and sets it on fire Didn't really like that computer anyways.