…a unicorn and a shark?
…a cornered honey badger and a zombie?
…a werewolf and a direwolf?
…a ninja and a guy that just works out a lot?
…your mother or your mother-in-law?
…a pegasus and a weasel?
Bookshelf Battle
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Bookshelf Battle 
I think there’s a lot of conditions to be made for the unicorn versus shark battle. Are they on land or in the water? In either case, is there a way for both animals to breath? I would think there should be provisions made so it’s a fair fight overall. But I think that in the end I would root for the unicorn, but bet on the shark.
Trick question – unicorns are pacifists and would just allow themselves to become shark food rather than lower themselves to fight a shark or any other animal.
A Trump and a Clinton…Weasel and a Weasel.