Late in the evening, a couple of young professional types are screaming at each other on Halsted Street. It sounds like one of those all-day arguments that begin on the telephone, pick up steam over drinks and dinner, and then blow up during the walk back to the car.

“What does that mean?”

“If you want sensitivity it’s in the dictionary between shit and suicide!”

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“That,” answers the guy, jabbing his finger toward her mouth, “is what I mean about you being a pain in the ass.”

At a downtown el station, a short, intense guy is addressing a couple of women whom he obviously doesn’t know.

He’s waving his arms now, but to no avail. A few feet away, a young woman wearing a backpack takes up the question.

“How do you know it was a woman?” Her voice is rising as she questions the guy.