I have always had really good reflexes when it comes to grabbing/swatting things out of the air when they are randomnly throwm at me, even when I'm not even looking.
But one of the coolest things I ever did...
In college me and my roommates built a water baloon launcher, It's pretty much a great big sling shot. We had it mounted on our upstairs balcony, so nobody could see it. On it's first night of completion we decided to break it in the moment it was done. It was getting dark out so we figured it would be safe to fire one off in any direction. I was elected to launch the first baloon. We lived in a Cul de-sac right off of campus, I decided to aim straight down the road towards an intersection. Well as fate would have it a campus bike cop just happend to be dart into that very intersection, and he just happend to be occupying the same spaceas the recently airborn water balloon. Yeah, for as tough as they like to seem, they are no match for a high velocity water balloon, it knocked his ass right off the bike.
Heh, good times.