"Mimic Octopus", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
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Even if the dictionaries are starting to give in, I refuse to accept 'octopi' as a word mainly because--I'm not making this up--there's a really satisfying climactic scene in the Orson Scott Card horror novel 'Lost Boys' which hinges on it being an incorrect pluralization.