Back in my Riding days I did not wear a helmet and these walnut trees are everywhere. I always worried a bit about getting hit in the head by one of these falling when I was running at speed. I think it would take you off a bike. But that is a very cool shot.
I remember breaking these in two, opening one end and sticking them on my nose when I was a wee lass. All the kids on the block would walk around with them on our noses. I vaguely remember calling them pollywogs.
Lol! And we also called them helicopters.