Thanks for all the feedback and glad some of you got a chuckle out of them scaring the hell out of me. I had heard it before when I had a group of about 10 around my stand and I shot one with a bow. It pretty much sent them scattering and I could quite a few doing it. I figured it meant danger and clear out. I have seen a lot of jump and get spooked but hang out and/or circle back but when they blow I figure it's game over.