Everyone has pet peeves because people are annoying, so the things they do are annoying. Not using turn signals, snapping gum and cracking knuckles annoy most people, but the sound of styrofoam, the smell of balloons and useless belts and buttons only annoy the picky.
But be wary of a person with a laundry list of pet peeves, as they are usually high-maintenance and hard to please and no one needs another mother-in-law.