The bulls where I hunt do more chuckling than anything else. If I hear one of those "perfect" bugles like on calling tapes, I usually wait it out. Most hunters will do the same cadence every time, where bulls will usually mix it up with a grunt, chuckles, just the sqeal of the bugle, or a combination. If I hear a realistic call and the occasional limb break, I'm more likely to head out. If the call isn't changing locations for a while, I'm very suspicious. I hunt in an area that gets a lot of pressure, and will occasionally get fooled. But if it sounds too pretty, it's probably a hunter.