Pet peeve 2: I hate double negatives.

[plunkybug]

Sometimes people are so stupid. I hear this all the time at work.

"I'm not computer illiterate."

This sentence means they ARE computer literate, as illiterate means "not literate" and saying you're not not literate means you are. In the context of tech support, I know they mean to say that "they are computer illiterate."

I don't have perfect grammar or spelling myself, but there are some things like this that just bug me.