NIAGARA FALLS -- Other haunted houses may snap photos of customers losing their cool, but Nightmares Fear Factory in Niagara Falls has turned it into an art form.

Each year around this time, the haunted house releases its annual best photos of frightened faces gallery.

Check out the gallery above or tap here to see it on your mobile device

We don't know what's freaking these people out so much at this exact point in the tour. But the Fear Factory says more than 135,000 people (so far) have "chickened out" and had to leave before the end.

And we do know it makes for a hearty laugh every Halloween.