What's the craziest thing you have ever seen someone do on public transit?
Given that the exact same question is the current top post but for driving instead of transit, I feel this question was needed.
My answer: I saw some guys hooking up a Raclette Grill to the outlet in an otherwise empty German intercity rail waggon. They had it unpacked in one of these 4 person seats with a small table. No idea if that could work or if draws too much power from the board net. I just headed on to the next waggon.
Some guy wearing a large hoodie got on the piss-soaked train right before the doors closed. As he was walking down the aisle he stopped right in front of me, pulled out a Taser, and lit it up right by my face. Right after he opened up his hoodie like the RE 4 merchant and showed a collection of batteries, tasers, Bluetooth speakers and all sorts of other junk. He was the world's shittiest salesman.