1. Using emojis
  2. Expense reports
  3. Anything religious
  4. Listening to music without talking in a group not at a concert
  5. When my mom talks about oral sex
  6. When I'm the only one not invited to somwthing
  7. When there is one person in the room not invited to something
  8. Public speaking
  9. When someone looks at me while signing. Especially if they're also playing a guitar.
    Suggested by @johnnyartpants