Reddit top comments...
Cutting in line. Fuck those people.
Playing a video or song loudly on their phone or tablet in a confined public place, like the subway, doctor's waiting room, etc.
The people who reply to amazon questions with "i dont know, i bought it as a gift for someone else" and " i dont know, it hasnt arrived yet"
People that stop or hang out at choke points - ie doors, ends of escalators, etc
People who bring 30 items to the express line of 15 items or less. They're usually the same people who pay in pennies and nickels too.
Clickbait articles, misleading thumbnails, fake news stories.
Driving less than the speed limit in the left lane.