Here are some thoughts;
1- Lines- chinese view things chaotically . it may be a train line, or a breakfast buffet, one just needs to be abet proactive. The worst/rude lines are subway line 1 in BJ at rush hour.
2- Babies with no diapers. IMO, there are 2 reasons, Its a summer thing, & also a social economic issue. Some just are culturally frugal and desire to save the $ on diapers.