Open up the calculator on your computer in scientific mode, punch in 25, then click the "Oct" radio button.
Christmas equals Halloween
25th December = 31st October
25 Dec = 31 Oct
25 <a href="http://en.wikipedia.org/wiki/Decimal">Decimal</a> = 31 <a href="http://en.wikipedia.org/wiki/Octal">Octal</a>
My favorite is the proof that girls are evil:
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