Minecraft wiki entry for Trap_design, associated text: A robber has snuck into a large obsidian-reinforced storage facility and walks into a room with a red wool floor. They hear an audible click before the opposite wall is pulled away revealing dispensers that start to pelt him with splash potions of poison and slowness. Before they can get away, a 9 block TNT charge goes off but since the room is reinforced the facility as a whole escapes unscathed.