Believe it or not, I actually spooked a pig last season with a loud fart. It came out a lot louder than I expected and I immediately heard a commotion on the other side of some thick brush about 15 yards away. I then heard some pig grunts and all went quiet. She ventured out about 20-30 minutes later and I popped her. Wind may have been in my favor, but I can't recall.....