Feel free to add on..
  1. Not having a signature on their emails
  2. Smoke a cig then loitering near my desk
  3. Flaunt their awesome lunches or snacks
  4. Assume I know everything about the company or customer
  5. Burn popcorn
    Have you never made GD popcorn in your GD life?
  6. Copy me on emails that do not pertain to me
  7. Talking very loud
    Almost like they're doing it on purpose...