A group of American teens comes Ireland to visit an Irish school friend who takes them on a camping trip in search of the local, fabled magic mushrooms. When the hallucinations start taking hold, the panicked friends are attacked by ghostly creatures; never able to determine if they are experiencing gruesome reality or startling delirium.

A newly married couple discovers disturbing, ghostly images in photographs they develop after a tragic accident. Fearing the manifestations may be connected, they investigate and learn that some mysteries are better left unsolved.

A group of attractive young people (of course) awaken to find themselves prisoners in a mysterious house with no means of escape. They are each outfitted with new accouterments–electronic devices attached to the base of their skulls–and a recording on a television screen alerts them of their task. In order to escape, they must hurt themselves and each other. The chemicals that the brain produces when in pain are collected by the devices, and when it collects a predetermined amount, the doors will be opened. Fail to do it in time, and everybody dies.