Other Stuff, Seoul
Queuing is a in the Korean dictionary. I experienced heaps of times people jumping queues, especially at the subway ticket booths. Completely unmotivated people will step in front of you and put money on the counter as if you were just sightseeing the booth. If it happens to you; complain loudly, push back, argue or even wipe the money off the counter. This behaviour really gets my blood boiling!
FYI, some public toilets are the traditional type used in the country. You will need to squat down over it and the toilet tissue should be thrown into the waste basket.