自從父親死於一場離奇的工廠意外,雅各的性格就變得異常古怪。他從小到大的好朋友亞當,為了讓雅各走出陰霾,幫他報名了當紅的整人節目「恐怖大爆笑」,準備回到當初案發的廢棄工廠,好好地「嚇」他一番!然而,原先做好的計劃全亂了套,發現自己被惡整的雅各,忽然發了狂似地拿起斧頭,朝著大家一一襲來!Jacob is a troubled soul and when his friends pull a prank on him in the very place his father was killed, he snaps, grabs an ax and hunts them down like animals. Trapped inside, they must fight for their lives from this disturbed ax-wielding maniac.