At school i was doing the experiment in chem where you heat up potassium nitrate to make it degrade. I heated it up for so long that when I accidently dropeed it on the bench it ate through the top and burnt all the way through.
I also once heated up a test tube and to cool it down i let water go in it…. it exploded! Probably dangerous when you think about it but at the time I thought it was awesome!
I don’t work in a lab now. Which is probably for the best for all concerned. 😀
But like the other guys, there was always interesting stuff happening at school. I remember one day we had to evacuate the chemistry lab. Someone dropped something into a Bunsen flame by “accident”. Can’t remember exactly what it was. I recall a purple gas, which might have been Iodine. But the teacher told us to get out pretty sharp-ish.