Latecomers to movie theatres think nothing about trampling over you once the movie has started. Even people that arrive on time find it beneath them to say "excuse me" as they step on your feet, passing in front of you to get a seat.
Bus passengers are another bone of contention for me. How about applying some common courtesy – in the form of deodorant?! It's simply disgusting to sit near a person radiating B.O. instead of a smile.
Speaking of foul smelling people, smokers reek of stale smoke. I think they should relegate a section in the bus for smokers, so us non-smokers can breathe in ease.