2. Whistling (thanks to Eunice and Gina for helping me discover this).
3. Pulling out your phone and staring at it, opting not to interact with the people around you.
4. Cracking your joints (knuckles, back, neck).
5. Laughing at inappropriate times.
6. Being disrespectful.
7. Falling asleep in the car.
8. Ganging up on the little guy.
9. Picking up on each other’s speaking / messaging habits.
10. Arm placement (while conversing).