NOTE: I checked with SNOPES and this really does work.
With all the fear of radiation fallout from Japan I thought it might be useful to tell you about a cheap, effective, homemade radiation tester you can easily assemble and rely upon.
Just follow these simple instructions:
OPEN A BAG OF ORVILLE REDENBACHER MICROWAVE POPCORN.
LEAVE IT ON YOUR KITCHEN COUNTER.
IF IT STARTS POPPING, YOU’RE FUCKED.