Or talking with your mouth full, or leaving the toothpaste open.
Small, nasty little habits we have, which can drill the small holes of annoyance through which happiness seeps out of a relationship. Everybody has them, the trick is identifying those you can´t absolutely bear near you. Like that awful smell that emanates from a day old gym shirt that´s still lying on the bathroom floor. Or putting on your makeup in the car. Although this may sound like we´re going into Seinfeld territory, there are some habits that really get you on the other side of pissed. And since they are habitual (hence their name) it is very possible that they will happen every day. Every day. For as long as you both shall live.
So, either be watchful and wary, running from them like a startled cat, or learn to accept and live with them. Because you have them too, and you may need some slack the next time those beans start making music.