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

2 weeks ago i borrowed an old military Geiger counter from a friend. I also dug out some old Coleman mantels (contains 1-1.5% Thorium). With both i went to the local grocery store and went around waving the counter until someone took notice of me. With the mantles in my hand under a bag of rice i showed them that the bag gave a reading, scared the poop out of them and made my day

That's just mean...funny, but mean