The Cheerios effect is the tendency of solids floating on the top of liquids to clump together due to surface tension and gravity and is named after the behavior of cereal in milk. The effect has even been applied in understanding the way gravity binds objects together in space. Reversing the system and asking how liquids behave on top of solids has revealed an interesting and unexpected behavior. On a sufficiently thin surface that can deform itself (like Jello), drops of liquid will repel each other.
Article:http://www.nytimes.com/2016/07/14/science/inverted-cheerios-effect-returns-physics-to-the-breakfast-table.html?_r=1
Paper:http://www.pnas.org/content/113/27/7403.abstract?sid=0e763463-de62-4227-88f0-e5d6bcb5d30d
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