Why is it so hard for people to understand the difference between "your" and "you're"? I realize that 94% of people who post messages on internet forums are stupid, but is there ever a dumber thing someone can type than 'your an idiot'?

I also hate PEOPLE WHO TYPE IN ALL CAPS. Even worse than all caps, I find there are some Dorks Who Like To Capitalize The First Letter Of Each Word They Type. There all idiots.