You know those things in life where they always expect that just showing you will be enough. Things to do with fire mostly. An interesting one I saw was a bubble tower, where Methane is bubbled through soapy water. It creates a vertical tower that can be several meters high of bubbles which can then be lit and proceed to burst into flames. Very fun to watch, and I know that if I got my hands on a tank of Methane, I'd try it.
Other ones are dropping Caesium into water. If I got Caesium, I'd probably try it out (if you didn't know, Caesium is highly reactive and melts, ignites and explodes in water).
There are other things, things that are much simpler and easy to do. My question for you is, Do you ever do things like that? Things that you know are stupid and that they always tell you not to try but you would, and maybe even did do.