I was told a funny story from the Soviet school days.
The active persons:
A chemist whom the whole school hates.
A boy who, as an adult, became a famous chemist.
Friendly class of n number of people.

A friendly class decides to go to a chemistry lesson and go see the puddle and eat ice cream.
A young chemist before leaving synthesized from the reactants in the chemistry office a solution of bartholet salt which he carefully soaked the pages of the journal.
The chemist enters the classroom and sees that it is empty. He gets out of himself, and on emotions beats the magazine on the table, as a result of which the magazine suddenly exploded at the blow. A shaken teacher fell on a chair, under which another explosion occurred, so it turned out that the little Heisenberg made several tablets of the same bartholet salt, which he poured under the feet of the chair.