I think you’ve already had it answered, but Jeff Goldblum as Ian Malcolm in Jurassic Park gives a fairly nice, simplistic explanation of it that you could recreate.
As he says, trying to predict how a drop of water is going to roll on the hand is very difficult, if not impossible. There are simply too many factors at play (imperfections in the skin, differences in the size of water drops, variations in blood vessel size as blood flows in and out, etc.). As more factors come into play in any system, outcomes become increasingly difficult to predict.
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