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Silly Riddle: why is "31 Oct = 25 Dec"?
Answer: when working in different number systems, "Oct" means octal, base-8, and thus "31 Oct" is 3 in the eight's place plus 1 = 3*8+1 = 25 --- and "Dec" means decimal, usual base-10 arithmetic, so of course "25 Dec" is 2 in the ten's place plus 5 = 2*10+5 = 25. So 31 Oct = 25 Dec, eh? (Maybe you have to be a programmer to smile at that one....)
(correlates: ReadLikely, TwoButNotThree, WikiGonzalez, ...)