Or just a joke. I live in a city with a metro system, I use it, and as much as I’ve never personally seen a fight in the metro itself, they obviously happen. Some users are stabbed a few times a year. I’ve seen people jump over the tracks. I’ve felt a bit threaten by a beggar that I’ve once said I recognized.

Just a few examples from here:

montrealgazette.com/…/two-men-stabbed-during-braw…

…ctvnews.ca/man-stabbed-outside-lionel-groulx-met…

And I’m not living in a very criminal city. I’m not saying the metro isn’t safe, or that you’ll see fights and brawls for the price of a ride, but it could happen. Like, take the metro when bars are closing and there’s probably gonna be higher chances to see a brawl or a fight. I imagine it’s similar in bigger cities with metro/subway systems as well.

And I want to stress that cities where this can happen are not inherently dangerous. There are much smaller cities that have a highest crime rate than the metropolis around them, but they don’t have the density for a metro/subway system where you can thus see drunk people fight about something they already forgot.