Play word 獄門 獄門 ごくもん decapitation (of a criminal) and exposure of the head to public view (Edo-period punishment)
Play word 打ち首獄門 打ち首獄門 うちくびごくもん beheading followed by mounting of the head on a pike in front of the prison (Edo period)
Play word 板子一枚下は地獄 板子一枚下は地獄 いたごいちまいしたはじごく there is only the thickness of the boat's planking between one and perdition