that feeling up the back of your neck

So I'm fairly sure I got cased out on the street today.

I was walking through downtown Lawrence, on my way to the coffee shop, about 9 am before all the shops were open. Bright daylight, chilly, very few pedestrians.

I cross the street from south to north, at the corner, and two guys cross from the opposite corner, from east to west. As they cross, one of them goes straight, but the other makes