I find them empty by the side of the road when I am out on bike rides, take them home and shoot them.
This time I tried to counterfeit the strange yellow fluid inside by using food coloring and water. I also set my flash controller for a long delay so that I could catch the steel bearing projectile far to the right.
It was traveling at about 700 feet per second.
I was lucky and the framing was fine.
In this picture I like the spray patterns and the way that the can is collapsing.
Lots of symmetry.