Advice

DO NOT ever shoot a paintball gun without clear permission to do so. I recently did this without clear permission and I ended up scrubing every tree and fence in our backyard (if you ever have to clean an oak tree, I recomend a pressure washer not a sponge). I then had to pick up all the casings (or whatever you want to call the latex stuff around the paint) every paintball I shot.
So if you don't plan on doing any of this, don't shoot your paint in the backyard.