Professor Julius Sumner Miller and his glass and a half of full cream milk and why is it so? I used to love watching his science show. I remember he filled a glass bottle full of water and reckoned he could use it as a hammer, because water doesn't compress. He wimped out as there was a small bubble from putting on the lid.
I really wanted him to belt in the nail he had set up, and remember screaming at the telly, that he should've filled the bottle in a bucket of water so there was no bubble.
https://www.youtube.com/watch?v=z3BSkMj1wLc