I am amazed that this is the first I have heard of this...I'm here everyday, usually read the student paper, and have heard nothing about it...(here is another link from the star bulletin...) It sounds to me like they are using baking soda and vinegar boobie traps...we used to make these to protect our forts when I was a kid....basically you just fill a smaller container with vinegar and put it inside a larger container filled with baking soda, when someone knocks it over, the two mix creating foaming gas (just like that volcano science project on the Brady Bunch), if you have placed a lid over it and sealed it, the pressure will build up until the container explodes.