Long story short, somebody was heading in for a drug test, when they decided that the (presumably fake/borrowed) urine sample they were bringing in with them wasn’t warm enough.
What do you do when you have something that’s not warm, and you want to make it warm? Well, you put it in the microwave, of course. Not just any microwave though, but the one at the local 7-Eleven. That’s what this person did anyway, and while at first their idea seemed to be working, it was only a matter of seconds before the store had to be evacuated, and bomb crews called in to check everything out, after the cup-o-pee in the microwave blew up.
It wasn’t just a loose sample bouncing around in there though, the person had wrapped a hand warmer around the cup before placing it on the turntable. The police say that the “chemical makeup of the hand warmer did not agree with the microwave and exploded.”
Check out the details here, and remember, hand warmers & microwaves do not mix, and pee is a lousy fire extinguisher.