Don't try this at home alert ... with a twist
The Sydney Morning Herald astounds with Unit bomb 'capable of destroying entire block':

A blind man who blew up his kitchen with a home-made bomb had enough chemicals, fertiliser and other components to destroy his entire unit block, a court was told yesterday.

Andrew James Neems, 24, downloaded information on bomb-making from the State Library internet archives which he converted to braille, police claim. He then bought the materials which he needed from several hardware stores.
...
Sergeant Murray said Neems had constructed a smaller incendiary device which he detonated with a match at 3pm after attempts to trigger it with a shockwave failed.

But when Neems failed to douse the ensuing fire on the floor of his kitchen with towels he was forced to call the fire brigade for help.

It was then that firefighters and police discovered the cache of chemicals and fertilisers.
...
He alleged Neems admitted when detained at Redfern Police Station to a "desire for revenge against other members of the community".

However, Neems's solicitor, David Carroll, described the police submission as far from "dramatic" and a "fantasy" that Neems set out to harm his neighbours or had terrorist ideals.

Mr Carroll said Neems, who the court was told had undergone a medical assessment while in custody and was found not to be mentally ill, had only caused a small fire in his kitchen with magnesium jelly which he lit with a match.

Sounds harmless to me.