It's when everyone walks through the door that this group splits into two distinct halves: the people who just stay terrified the whole way through, and the people who, after those first couple of scares, realize that this is going to be a bunch of county fair bullshit that they've seen a million times already. Sure, as things progress, different elements (loud noises, strobe lights, a dude wielding a power tool, etc) will be added to intensify the experience, but it all mostly relies on you not being ready for what happens when you turn the next corner.
I'll admit that this was unexpected.
So, you know, to make things easier on yourself, just buckle the hell up whenever you turn a corner. Especially if you're in front. If I'm walking through a garden-variety haunted house (the kind that lets high school kids through with parents and such), two things will happen: 1) someone between the age of 14 and 16 will ask me to pretend to be their dad so they can go in (and I will do it, because kids need to learn to disrespect authority and trust strangers as early as possible), and 2) I will demand to be in front of the group.
Other people's panic (OPP) can be contagious. That's why in a perfect world, every haunted house would make the most clearly terrified person lead the rest of the group. Instead, they usually just let the group decide. If the person in front isn't losing their shit at every turn, that will rub off on the more moderate members of the group, just like panic might.
What I'm getting at is that I'm the asshole who ruins every haunted house for everyone else by going through it with the attitude of the dude in the front row of a comedy show who just sits there with his arms folded, refusing to laugh. Sorry.
I'm fun on April Fools Day, though!
Of course, all this only applies to the more family-friendly haunted houses, where things like touching are off-limits. As mentioned in the intro, there's another class of haunted house that's gained popularity in recent years. The kind that promises an experience more shocking than anything you've ever encountered before. They're so intense that you have to sign a waiver absolving the operators of any liability for what might transpire inside.