So I've started to watch the Cosmos series with Carl Sagan on YouTube. Already in the second episode there was a wonderful example of (not so) natural selection.
Begins with a back-story in 1/6 and concludes at the start of 2/6.
Basically it demonstrates how over time (
relatively short time) humans served to select crabs with a certain pattern on their carapace (samurai warrior face) and thus such crabs are far more numerous today.