If you haven't seen the cool YouTube videos of people dropping Mentos into bottles of Diet Coke, you've probably been living under a rock for some time. Strangely enough, there are still people out there that have not experienced this phenomenon.
This brings me to my latest April Fool's gadget. All you need is to affix this little guy to the top of a 2-liter bottle of Diet Coke, load it with Mentos and wait.
Eventually someone is going to get curious and decide to pull the pin. You may want to add a sign asking people to not pull the pin. There is going to be someone that walks by it and can't resist. They will be quite shocked as the liquid comes gushing out onto them. The best part of all is that you get off easy, after all you did put a sign on telling them not to pull the pin.
Mentos Geyser Tube - Pull The Plug And Run [via uberreview]