Public transportation is really weird because it forces you to spend time with complete strangers and they aren't always mentally sane. But as long as you don't interact with each other, there's no reason to become alarmed.
Fashion choice is a really important subject and some people just don't get it, like at all. So when you're sitting for a long time next to someone with an odd taste in fashion, that's when you start to realize that you were completely oblivious to a whole category of people before. And it's not just that, sometimes they tend to also have accessories, and in a couple of rare cases, these accessories are living, breathing creatures. That's when things start going out of hand.
This is why public transport sucks, but at least you get to see some interesting things that will stick with you forever.