What annoys me the most is the generally rude people I've come across in my years of attending Halloween attractions. I can't vouch for anything at HHN, but I have my share of annoying/rude/drunks up where I live. For example, last year, I went to a local place called Slash Moraine. I was with my father, and right behind us was this positively irritating group of teenagers who were being a bunch of rude snobs. Yelling out "Not scary!", trying to scare me, attempting to scare everyone else...It was quite annoying, to say the least.
When I was eight years old, I went to a haunted hayride. There was a couple of drunks on the tractor ahead of us, and everyone could hear them loud and clear. I vaguely remember them trying to shove each other off of the ride, too. Ugh. x_x
My other complaint is when (this is going to get a bit hypocritical, here) parents bring their young'uns to the attraction. I, personally, have always been intrigued by HOS, HHN, and the like; I have never screamed too loudly, hopefully haven't been a bother, or been an a-hole. But when you bring your seven-year-old brat who screams at a pumpkin with a smiley face carved into it, who pushes everyone else around, and acts like a girl from My Super Sweet 16, that's when I get cranky. I've had my experiences with this, especially at Halloween Haunt and Slash Moraine. Seriously? Even though these places take place at Kings Island and Splash Moraine doesn't mean that it's going to be a kid friendly event.