Strolling Shadow

This is going to be a rather short story, because there's just not that much to tell. It would have been better, but with the 1500 character minimum I had no choice but to add a bunch of filler.

It occurred about a month and a half ago at one in the morning. I was driving back home from my friend's house and I saw something out of the corner of my eye on the sidewalk. I was maybe a third of the way through my cigarette, and I was stopped at a three-way stop sign, so I paid whatever-it-was no more attention than just a glance.

I let another driver go in front of me (they were at the stop sign before me), and then they just slammed on their brakes forcing me to stop. I was perturbed, to say the very least. What sort of idiot just punches the breaks when there's a car behind them? Then I looked out the window back at the thing I had seen before, which was...nothing.

I saw what they were looking at: it was a shadow of a man walking on the sidewalk. The only inconsistency was that there was no one around on either side of the street who could have produced it. It was just the shadow, out for a stroll. It didn't seem to notice that two cars were stopped in the middle of town just to look at it.

Since then I've tried replicating that every time I pass by that section of town, even in the day time, but I never could.

What do you guys think about it? I've heard of Shadow People, even seen a few of them, but this... This was a little ridiculous. Have any of you folks seen anything like this before?