Unexpected encounters

As I was walking to work this morning, a dove fell on my head.

I'm serious.

I got off the bus, crossed the street, walked below a line of trees, and pow! Dove on my head. I think the poor thing was as surprised as I was, if not more. I suppose that when you're a bird and used to being able to fly, falling out of a tree is a tad surprising.
From my head, it fell to the pavement, shook itself, and hobbled off to hide underneath a nearby magazine rack. It didn't so much look hurt as stunned, or maybe embarrassed. I brushed off my hair - luckily, the dove was too surprised to leave a lasting mark on my hairdo - and went on my way, already being late for work.

Imagine, though. What are the chances of having a dove fall on your head? Is this some kind of omen?