If an alien came to earth, it could learn most of what it needed to know about humans by watching drivers on a rainy day.
Specifically, drivers on roads where there are blocked drains, huge puddles and pedestrians on the pavement.
Most will drive carefully around the water, as far as is possible.
A few obviously don’t notice the puddles, and drive on with a look of shocked remorse.
And some will take great pleasure in driving at speed through the buggers, and laughing as they leave hapless souls standing sodden on the pavement.