BTW this is not my code.  I found it on a forum and I thought it was funny.

HAI
CAN HAS STDIO?

SO IM LIKE FIBBIN WIF NUMBAR
    NUMBAR IZ BIGR THAN 1. O RLY?
    YA RLY
        BTW fib(n-1) + fib(n-2)
        I HAS A FIRST ITZ FIBBIN DIFF OF NUMBAR AN 1
        I HAS A SECOND ITZ FIBBIN DIFF OF NUMBAR AN 2
        I FOUND SUM OF FIRST AN SECOND
    NO WAI
        I FOUND NUMBAR
    SRSLY
KTHX

GIMMEH THING
VISIBLE "FIBONACCI SEYZ: " N FIBBIN THING!
KTHXBYE