Some of this stuff sounds more serious than just a pet peeve, like leaving child/animal in a hot car. That's dangerous and a very good reason to get upset!

I can't stand the packaging on anything electronic

Sales people in a commission based job, usually I end wasting tons of these people's time. I can't stand when I can feel the breath of a sales person down my neck when I want to make a large purchase.

Telemarketers that hang up me when I"m just trying to get on the do not call list. They are wasting not only my time but their time in the future when they call me back. Really irksome.