and if you read that title in Peter's voice you get +1 internet

You know what really grinds my gears?:
People that walk all over you then get upset when you do the same to them.
Chavs.
Fat people in denial about their weight (the same that like to pick on thin people for example) "Are you saying I'm fat" - "I'm not fat I'm curvy" ...You're fat.
Ignorance.
Forms that want to know every.little.fucking.thing about you, from your name, date of birth, to how many squirts came out in your last happy hour.
Vanity.