Rock Around The... Frock! - S1.E4

It is noon in a quiet little town and the monk enters the church to fest his eyes on the mechanical nativity scene. However, his cloth gets stuck in the displays gears and while he tries to save himself from being eaten alive by the machine the nativity scene gets engulfed by madness. The three kings beat each other up, infant Jesus sets fire to his crib and the animals start humping each other and the kings.