For starters, watch this video at 200 Weeks. It took me 3 or 4 goes to get it.
Had my own "blink and you'll miss it" experience this week. I was tailing this guy, taking it easy, when his sunnies popped out of a pocket on his back pack and when flying past me. I was thinking of posting a bit of video on it, but it's not that interesting.
I overtook the bloke and told him he'd lost his sunglasses. As he had headphones on, I am not sure if he heard and understood me. Just hope he got them before they were squished.