If there's one thing that bugs the piss out of me, it is this:

When I buy a spiral-bound notebook that claims to have perforated sheets of paper in it, I really get annoyed when the sheets are so poorly perforated that they might as well not have been perforated at all.

What good are the perforations if the page doesn't tear along that line? That's what I get for buying the cheapest notebooks I can find. :(