He Who Lurks Beyond The Veil
When in doubt, ask yourself, What Would Diogenes Do.
I've heard the explanation before. That's why I was attempting to tease him about octopi (my phone corrected to octopu. I think that's octo droppings.) Octopuses is proper in English. You're correct about the Greek. But I think in common vernacular all three pluralisation are accepted.The problem with octopi is, is that octopus comes etymologically from greek, not from latin. Therefore octopi is wrong. Octopuses is fine, though the proper pluralisation would be octopodes.