This
one.
Some people seem to have the idea that 'if I'm entitled to it,
then I can be rude'.
Once while I was sitting down in the MRT, some guy came up to me
and rudely exclaimed 'Do you know that my wife is
pregnant? Can you give her a seat or not ?!?!?!?'
Sheesh man, I didn't know your wife was pregnant under all that
flab she has.... couldn't you just ask me nicely? 
Some people just want to take their frustration out on others by
snapping at them, whether it's warranted or otherwise, and it's
happening more frequently.
