Which reminded me of an 'incident' in the metalwork room at school a long time ago. Two of the class had discovered, via the geography class, that diamonds were made by carbon being placed under extremely high pressure. They decided that this could easily be transferred to the school room by
1. joining 2 bolts with one nut packed with caster sugar grains
2. tighten the apparatus with spanners / vice
3. heat the metal using the gas blowtorch in the metalwork room
The result, fortunately, was that, after exploding one of the bolts embedded itself in the ceiling tiles, the other in the blowtorch table and there were no injuries.
There were no diamonds created.