I wish I could have voted for all.
Shoganai definitely has a point - in italy, outside a couple of places where silence still is golden, people will usually spend the whole time talking to the telephone. Indians do that too! They all talk loudly about whatever, and most of the times you get to hear unwanted details about their private life. They really have no shame whatsoever, nor any modesty. Japan, with the rule of not talking to the telephone while on a train, is the best place ever. That rule alone makes it the best place in the world to my eyes. I still remember vividly this woman who answers her phone, saying
"I can not talk right now, I'm on a train." And closes the conversation with no further wasted time. Awesome.
Also trains and metro and buses in italy often have broken air conditioning, broken doors, broken windows, broken seats, they are often late for apparently no reason at all, the low-priority trains often stop at a specific train station to let another train go on wasting 20+ minutes when they could do that stop in the following station which is even bigger, etc.
The noise is often unbearable, especially when the windows / doors are broken... or even absent.
And the smell... well, that comes with the people. Even though when you notice there's no fucking air whatsoever in the train because of how many people there are, why don't you just add a couple of carriages? You damn bastards.