Octopuses good, octopi non-existent.

Note to world: the plural of octopus is octopuses, not octopi. I have discussed this with more than one expert on octopuses, and they consistently report that 'octopi' is is just plain wrong. Octopus comes from Greek roots (octi=eight, pous=foot), not Latin. Greek does not pluralize words ending in -us by ending in -i. That is Latin. The old fashioned plural was octipodes, but that went out with dropsy and mammifers.