whizkid,
well i always believe that sense of humor come from deep down
inside...... sometime no matter how hard one tried, there's just no
way he/she can be as humourous as the pple ard them........
but, i am sure if the friends u mixed ard have much sense of
humour, u will be more or less be affected, and turn to appreciate
humour better 
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nOthiNg iS ImpOsSibLE In tHiS wOrLd
EvEn tHe wOrD ImPoSsiBLe SaYs "i'M pOsSiBLe"