Today's award goes to Egyptian science teacher Ahmed Gabr. The Express reports:
Terrified children were left screaming and fleeing from their classroom in Cairo, Egypt just moments after Ahmed Gabr, 38 showed the class how to produce a mild reaction by producing oxyhydrogen - or bang gas as it is also known.
But the chemistry teacher has now become a worldwide laughing stock after he bungled the quantities, which caused the tumbler to explode, showering the room with sparks, flying glass and boiling chemicals.
Some of youngsters could even be heard praying as they fought to escape from the classroom while others shouted out in distress.
There's more at the link. Here's how it happened.
Interesting reaction . . . in both the chemical and human senses!