I do wonder at some of the stuff on Youtube. I guess the videos and advice on the internet are worth what you pay for them:) That said, I have seen some stuff that is downright dangerous.
sure, some people think its pure fun, and dont think about the safety, untill the day they or someone els get hurt.
I have seen people pouring on the outsite surface, i guesh they haven seen molten metalīs reaction when it hits concrete with a little moisture in it, well i have, its becomes a projectile.