When placing cogs in the Trail of Treachery map, I dropped a cog to fight off the horde and it slipped behind the stairs, near an enemy spawn point. Despite numerous attempts to grab it, or get in to the space to access it the cog remained out of our reach and we were completely unable to progress.
This also lets people troll the run by throwing it OOB like with the barrel on Enchanter’s Liar forever ago. Just had some melonhead chuck it during a cata run.