The Leidenfrost effect is one of my favourite physics effects, daily present in common things as a droplet of waiting failing on a hot pan, it can be driven to cool experiments like this one done by undergraduate students from Bath University.
When a liquid comes in contact with a surface twice as hot the liquid's boiling point, the liquid never touches the surface: a vapor barrier prevents the two from touching. If the surface has saw-tooth like edges, the doplet will move as shown below.
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