a good one.A good friends young son is a tinkerer 11,he has disasembeled several soft air guns and replaced or stretched,the spring inside to make them shoot further,among other things.dads proud.recently he made a bomb out of 2 liter bottle w amonia?or baking soda and tinfoil?cant remember seen it done w Mentos on tv.anyway he talks to his schoolteacher about it and she thinks its a neet project/experiment so he takes one to school and the class goes outside to see it in action.ON THE FRONT STEPS OF THE SCHOOL!he suggests the playground out back, but the teacher says no lets do it out front.so everyone stands back,he puts the cap on and momments later BOOM.The local police happen to be driving by and are not nearly immpressed as the rest of the class and teacher! officer calls the father and begins to question him about his son and the incident but did not immediatly identify himself,dad goes into an explicitive "who the he.. are you to bla bla" w much more explicitives, response to questions and tells him he thought it was a bad idea,but the teacher was all for it so he thought it must be ok.about 5 mins and finally the officer says "Sir IM...... w the....police dept".OOOPS!he did not encourage this,and no kids were hurt by the thing.I told him you better hope he dosnt pull you over IM sure he knows your name.the FBI probly knows your name!these things are not as dangerous as it sounds,just pretty loud.and he is a great father.