When we first moved to the DC area (well, back then it was just me, but Ellen joined me just less than a year later) we didn't exactly live in a bad neighborhood, but, since we were on the top floor of a high-rise, we could see them all around us. There were lots of mysterious sirens most nights, and one memorable occasion when it seemed the entire Arlington police department was raiding the garden-style across the street, but we never saw anything like this.

Via Siflay, who also linked up this OCD-afflicted cat.