Last night, I was telling my parents that it takes about eight minutes for sunlight to reach Earth. When my father asked how they ("they" being the scientists, of course) knew this, I told them they had obviously measured the speed of light and knew how long it would take for it to travel from one place to another. His response?

"Light has speed?"

And this here -- this more than any of their ignorant stances on evolution, overpopulation, or religion -- is a perfect example of why I can't stand living with my parents, especially my dumb shit-for-brains father.