One summer back when I was a Boy Scout, I spent a lot of time at the rifle range because ammo was free that year (donated by the National Guard, I believe). So, being all I could shoot, I tried to shoot all that I could. One afternoon, I'm on the line firing my ten shots when someone starts yelling "cease fire!" We all stop and back off the rifles as we were told to do. And here comes a cow wandering onto the range over the backstop, wanders down between the positions and the targets, and starts grazing. Turns out a dairy farmer had property that butts up against the camp, a couple of cows found a sopt where the fence was down, and came over to have a look.