I was at the pharmacy and this guy in front of me was buying every packet of pop rocks they had. It must have been around 500 packets. He pulled out a huge wad of cash to make the purchase and was asking the clerk if they had anymore. When the clerk said they did not he asked if he could get a list of every other store in the area that had them.
So, I had to google what you do with these things and found this
story on mixing pop rocks with meth