I'll usually push those who were preparing to rush into the
train while i'm obviously going to get down from the train.
And i purposely stand at the waiting line(front) while others are
eagerly waiting to 'rush' into the train. I'll wait for all the
commuters to alight then walk in...you see all those Lan Lan faces
standing behind me, also got to wait. 
Yes, i'm one of those who got no manners...