Minecraft wiki entry for X-ray_glitches, associated text: Another X-ray hack allows you to ride a pig in a 1 1/2 block high space. Place top slabs one block up from the floor, then ride a pig beneath them. This should glitch you into the ceiling. The only challenge about this hack is getting a pig down to the bedrock layer (which is most effective). It is easy to just push the pig down a shaft into a water landing at the bottom.