Saw one during my morning trip to the physical therapist.
It's rush hour, so El space is at a premium. I'm waiting on the platform, and the train arrives. The doors part, revealing a tightly packed commute and, getting off the train as the doors open, a woman with a lit cigarette dangling from her mouth.
1) No smoking on public transit.
2) The train jostles quite a bit, so the dangling thing means that it's unsecured.
3) The train was packed, so that means that there were any number of opportunities for said cigarette to burn someone just from them brushing against her.
Who does that?!
(Side note: I really need to get the heck out of this city!)