I think that the definition of a "scientific" experiment should include harmless fun that leads to an exploration of science. I'd argue that children (young children especially) are the world's most active scientists. Every time they throw something, climb something, jump off of something, fall down, get up, etc. they're conducting a physics experiment.

If calling a just-for-fun HCl+Al bomb a science experiment helps the world to gain another scientist, or even just a well-rounded, open minded, curious adult, then yes, let's blur the distinction between blowing stuff up for fun and "science".