Alexandrines on the bus

As I was riding on the number 52
These guys got on and then attempted to pursue
A conversation with all those who sat around
Apparently they're tired of seeing all our frowns
The smile I gave to them was very small and tight
And then I turned my gaze outside into the night
I think it's only natural that when we're close
As sardines in a tin we become less verbose
Pretend that we're not packed in a great human pile
By keeping to ourselves. But you say I should smile
I really can't care less for all your "shoulds" and "oughts"
I think you should get lost and leave me to my thoughts