Ruining building somehow. That's all the game has left. (Granted, this seems like Mojang would have to do this intentionally. How could one ruin something like this? Then again, the boat controls...)
Adding an ultra charged creeper, that spawns after 5 days at a 50% spawn rate, that when explodes, deletes your world and makes you pay 20 dollars to get it back.
What I think is probably thirst bar. That'll be annoying!
I've hated squids since I saw them. Anyone else?
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*Hits CAN with a wizard's staff*
There are witches, which are close enough.
Oh wait.
But really, for the game to stop updating (especially without the official API). Let's hope nothing bad happens to Jeb or Dinnerbone any time soon.
Keep scrolling. Just keep scrolling...
--Neil deGrasse Tyson