I'm gearing my bear druid up and seeing as to how end bosses essentially drop double loot and double JP, I've taken a habit of queuing and dropping if it's not a dungeon in progress (in progress dungeons I've found are also more likely to include groups of friends and if they've already gotten a boss or two down it's far more likely to make it to the last one, plus you don't get dungeon deserter if you leave). So I get into a dungeon in progress and it's on the Foe Reaper trash. Awesome, because I need the mace. We down him (barely) and the sword drops. Oh well, there's really nothing else good in here for me and I don't feel like spending 45 minutes to get to VV so I drop group and re-queue up. Dungeon in progress pops and it's the group I just left. Oops.