If you do these during a lecture or discussion I silently seethe at you for the rest of the semester (or until I am distracted by a MORE unforgivable act)
  1. Bringing a multi-course, noisy or particularly pungent meal to class
    Why are you eating a Cajun chicken burrito in a statistics lecture? 85% of my focus has already deteriorated and you're not helping. If you had time to go to Qdoba you probably had time to eat it before class too
  2. Taking a phone call
    I don't care if you're sitting in the last row. Not only will I begin to wonder if you were raised in a barn, but you will hamper my learning by unwittingly engrossing me in your conversation with your mom about your wayward cousin's upcoming wedding