Preform Item Duplication by dropping an item and pause buffering, then saving and quitting the world when the item is on the ground and in your inventory, in 15w38b WONT duplicate the item, but mess graphic generation up. All Colision is the same before the glitch. A similar glitch occurs in 1.8 where setting render distance to ~15 will glitch graphics, though it will be less flashy. I have never seen this glitch posted ANYWHERE. I've only tested 6 wood, 1 Diamond block, and 6 Diamond Block duplication on 15w58b. NOTE: This glitch can cause seizures, I think. EDIT: Now I have a world with Infinite glitchiness! (Woooo!)