I say that primarily because of the clientele. Take this fellow at the Scarborough Town Centre rapid transit station Saturday night.
I'm waiting for a train to go to Kennedy station, as are four other people. Some fellow walks by me, showing vague signs of unsteadiness.
He stops about 20 feet to my right. He advances right to the very edge of the platform (i.e., on the "yellow"), his toes just sticking out, his gaze fixed on the tracks below.
"He's not going to do what I think he's about to do, is he?" I asked myself.
He did.
The guy locks, loads and starts taking a pee. When he was done, he uttered a loud, satisfied-sounding "ahhh!" He arched backward as he did so.
However, once he finished relieving himself, only he then did he seem to notice the other people on the platform were regarding him with something akin to disgust.
At this point, he gets shy and walks to the far western end of the platform, where he leans against the wall, stares downward and occasionally mutters something unintelligible at the rest of us.
The things I put up with to not drive a car.
Addendum
For a dog-related story along these lines, click here.