Here's a question and a few possible answers: 

Q: Humans have a number of body parts that serve multiple functions.  Name something that they have an abundance of, and which serves a dual function.
Possible A: two arms, lay eggs, video game, two eyes, ten fingers

Why is "ten fingers" an answer aligned with human common sense? 


an abundance naturally means more than two and fingers are the only thing on the list we possess more than two of.