Reasonably proposed as Edvard Munch's memory of the sunsets caused by Krakatoa a decade before, 'The Scream' was so called when Munch collected his masterful impressionist landscape, having displayed it for six months at the Norwegian National Gallery, to find that some old Spanish lady had painted her attempt at Jesus Christ into the foreground. Which is why the figure doesn't look like he's screaming so much as impersonating Larry Grayson. Apparently, as with the sound of the third August 27th explosion at Krakatoa, Munch's scream travelled three-and-a-half times around the world.
Lesson 1 in Metalwork class when I was 12yrs old. And yes, the outcome was demonstrated and another lump taken out of the floor. I've used lathes on and off all my life, and have had my own in the garage for 30yrs. I can guarantee I've NEVER left the key in the chuck.
I have seen chuck keys fitted with a spring at the bottom meaning the key will not stay in the chuck without being pushed in. I have been known to launch a key across the workshop if I found it left in place. Saves it knocking lumps out of the bed