What if one day you were sitting at your computer and, startled by sounds of shuffling, turned to see a crab standing at the farthest corner of the room, staring directly at you? It would click its claws, acknowledging your gaze. For the rest of your life the crab would stalk you from a distance. Nothing you could do would stop it. No matter how many times you'd kill it, within minutes it would return. You would begin to wonder whether the same crab continually reincarnates just to follow you, or whether some kind of crab king is sending its minions one by one to spy on you.

What would you do? Would you still be able to eat at seafood restaurants? Would you be able to explain just how a crab got onto an airplane with you?