What mailbox?
The most dangerous thing I played with as a kid was Magicians Flash Powder. All I can say is OMG! When you put a bunch of this in a 16 oz. soda bottle through a long speed wick in it, and then wrap it up with a half inch of duct tape, you have something wild. I placed the first one of these at the base of a 6-7' thick tree. When we lit it we ran fast. It took that tree down like it was nothing. It was dark out, the blast was so bright (like a flash from a camera) I can still see it like it happened yesterday. If we looked at it, we'd probably all be blind. Oh memories! The things you could buy from a liquidator. There were a couple more experiments, but this is all I'll say.
