If it was legal I could come up with some quality entertainment. I've had a huge interest in explosives since my early teens and can make pretty much anything from black powder to improvised TNT, all from memory. I don't do it any more though since learning quite how seriously it can be taken. I think if it wasn't for a reference given for me from a personal friend who is a retired prison governor I would have done a couple of years. I've got too many responsibilities to risk making even really small stuff as a joke these days.
Youtube is a great watch for me now. Search for the right things and you can watch crazy people all over the world making all the things I used to. My very favourite which was very impressive, relatively safe before it dried and easy to make was Nitrogen Triiodide. Put a tiny amount (I was always careful to only use enough to make people jump without getting hurt) of that somewhere people will walk in mid summer and it'll dry on the pavement in minutes. When someone walks past, well...