1. People whose seat to ass ratio is 3:1
    Static
  2. People who leave their backpacks on
    Static
  3. People who "don't see" you looking for a seat
    Static
  4. Little old ladies who push you out of the way
    Static
  5. Taking transit in general now that I have experienced what it's like to be chauffeured about by @krystian
    Static