competition: What really grinds your gears?

What grinds my gears:

people who type like Halogirl123.
People who type "lyke dis", who force me to decipher my native language.

"ppl" "lyke" "nd" "yu" "yur"...it certainly is annoying.
I know people that type like this may not be idiots, but you're definitely coming off like one.

Also, if you type in all caps.
Stop it. Bad illiterate moron! Baaaaad!