You remember that moment when you were a child and you imagined a hand coming out from underneath your bed in the middle of the night? Nothing quite compares with the feeling of sheer, adrenalin-pumped fear. Unless, of course, you're a full-grown adult visiting the Nightmares Fear Factory in Niagara Falls.

The fear factory experience - which takes place in a pitch black maze - has released a genius photo album of adult men and women frozen in fear as they stumble upon some unknown horror. Quite what provokes such a hilarious range of contorted facial expressions is not clear: but whatever it is, it's well and truly terrifying. Come see adults reduced to quivering wrecks in our faces of fear gallery below.

Click on an image below to launch the gallery

Faces of fear