I had an older professor of physics at the university (I was studying physics) - he was a theoretician. Once a year he felt the need to make an experiment "for

I had an older professor of physics at the university (I was studying physics) - he was a theoretician. Once a year he felt the need to make an experiment "for completeness". As good as he was as a theoretical physicist, he was a walking disaster with experiments. In mechanics there is an experiment where you sit on a chair, with weights in your hands, someone makes you spin and then you extend the arms and the movement is slowed down (conservation of momentum if someone is interested). He wanted to show this, sat on a chair, extended his arms and asked a student to spin him fast. And then retracted his arms next to the torso. He flew two or three meters away from the chair and fell down, with us jumping to help him (he was something like 70 at that time). After getting back to his senses he continued with an experiment where you hold a bicycle wheel in your hands by the axis, it spins quickly and you cannot flip it right or left. So he did. And then he was left with a spinning wheel in his hands, wondered a moment what to do with it and simply dropped it on the floor. It is amazing he managed to squarely hit the audio system of the amphitheatre which did BOOM and we did not have sound anymore. That was the end of the experiments for that year.