A 39 minute 1963 film by Alfred Leitner demonstrating the remarkable properties of liquid helium when cooled below the lambda point (the superfluid state).
39 minutes in
2,
3,
4,
5,
6 parts
(couldn't make a playlist because they don't all allow embedding)
You can also watch or download the full free DVD and more demonstrations
here.
Maybe not for everyone, but I thought it was quite interesting.
Liquid Helium Superfluid, a Physics Demonstration
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