I had a very close call a few years ago. I was just entering the woods, and rode round the side of the gate. As I did so I see a big 'ol turd right in my path. Not fresh, but fairly recent, I'd say. So I swerved and missed it by an inch or two with my front wheel.
Unfortunately, my back wheel scored a bullseye.
Now, I put this down to the dusty surface (like flour stops your pastry sticking to the worktop) but my back wheel neatly picked the whole turd off the floor, and gently flicked it in a beautiful arc that took it just past my left ear (I'd say within an inch) and sloooooowly over the bars near my left hand onto the floor in front of me, where I then succeeded in missing it properly. I felt, smelt, and heard it pass my face. Nice.