Exactly. If you want to explain something boring like "why generic functions and not single-object-dispatch," then use examples like these:
A short example: Imagine you have a class human which is inherited by a class male and female. Now as we all have an urge to reproduce where to put a method for having sex? Create a method haveSex in the human class, duplicate it in male or female? What would the argument to such a class be? What about having sex with people of the same sex, toys, animals, buildings...