I did the same thing, Special-K. Then I had to send the Wired story.
This reminds me of the improv group in NYC that I heard on TAL that would fake people out for the fun of it. It really wasn't improv at all. It was very well planned and rehearsed. It was sort of cruel.
Anyway, this popcorn trick wasn't cruel but seemed totally random to me. I was skeptical but wanted to believe!
My Dad sent it to me, I fell for it too, and then I researched it because I figured there would be some scientific explanation. Sadly, the debunk soon followed. It was such a bummer because I was going to post it here, too!
Text at bottom of page: Il parait que si on met quelques grains de maïs devant des téléphones portables, les ondes émises lors d'un appel ferait assez de chaleur pour transformer le maïs en pop-corn. Je vous rassure c'est un fake, une publicté virale pour la marque Cardo, un fabricant d’oreillettes Bluetooth.
Rough translation: It appears that if you put corn in front of cellphones, the waves generated during a call create enough heat to pop the corn. I can assure you that this is a fake, and that it's viral advertising for Cardo, a Bluetooth device manufacturer.
(also because I'm never allowed to write anything about it while it's "embargoed" and often watch people fall for shit for like a week before I can finally post who dunnit - and by then I'm so over it I just post "X did Y" instead of a proper writeup)