When I was a kid living in PA, one of my neighbors had an owl decoy, and you could pull a string and make the wings flap. We would put black rags on the ground around it that looked like crows, then when a flock came by we would blow crow calls and work that decoy. The crows would go nuts over that owl decoy and attack with abandon. We used shotguns with the plugs taken out. Lots of fun. We set up on a tree line next to my dad's corn field.