When we see something frightening headed towards us, one of the most obvious involuntary actions is to pull a stupid face. But why are all of these people so scared?

It turns out that they're at the Nightmares Fear Factory in Niagara Falls, a haunted house attraction that is famous for scaring the hell out of its customers. As you can see from the pictures below, they're pretty good at doing their jobs. A look through their Flickr will turn up plenty of frightened faces that are caught on camera during a scare, but we've take a few of our favorites and posted them down below.

Nightmares Fear Factory

Hah! They're so frightened that they're trying to run away in different directions!

Nightmares Fear Factory

The girl on the left is feeling fright so strong that her hair's going all cray-cray.

Nightmares Fear Factory

We have no clue what the dude on the left is doing, but it needs to become a dance crazy, NOW.

Nightmares Fear Factory

We absolutely love when folk are scared enough to use their loved ones to protect themselves.

Nightmares Fear Factory

That's either an A+ scared face, or this guy's best Heisman trophy pose.

Nightmares Fear Factory

"Take my ticket! Take my jacket! JUST STOP SCARING ME!"

Nightmares Fear Factory

We suppose that a second after this picture was taken, these two boys melded into one giant scaredy cat.

Nightmares Fear Factory

There's a chain of arms, a guy who looks incredibly pained and a lot of confusion. But what they didn't see was the extra pair of arms in the background. Oh, no!

Nightmares Fear Factory

Every face shown here is absolute GOLD.

Nightmares Fear Factory

Imagine how scared you'd have to be to clutch onto another person like a koala.