On one recent car trip my mates and I were discussing the endlessly fascinating world of English Language.
When one of us brought up the famous "octopus plural becomes octopi" it started a whole gamut of interesting ideas. "solar plexus" became "solar plexi", "campus" became "campi" and "fuss" became "fi". (see here for more ) We messed around, thinking of many other words that we could apply this rule to.
(One interesting one we came up with - plural of 'bus'? Bi!)
The riddle simply is this: Given that EVERY word in the English language would obey the above rule, what plural of a plural would make it's singular?
Please peek at the following disclaimer/clue ONLY when you've totally given up, downed your last twinkies and about to trash your brothers PS3 out of frustration... ONLY then may you peek..
This puzzle was very successful when tested out verbally. Seeing it now in the written form, I see how it may be much easier... but hey! that's showbiz.
(Post edited question - I don't think this disclaimer applies anymore...)