Watching the lunar eclipse while lying on the warm concrete with a couple of acolytes and a bunch of ants:
Acolyte 1: "So, do you know what causes that?" pointing at the proceeding eclipse.
Acolyte 2: "We think it's a planet doing it."
Me: "Well it is, it's earth."
Acolyte 1: "No, we're on earth."
Me: "Yes, planet earth. It's earth's shadow on the moon now."
Acolyte 2: "So then what makes the moon shine?"
Me: "The sun."
Acolyte 2: "Oh no! Hey, so should we be looking at this without special glasses?!" pulling his cap down farther over his eyes.
Me: "We're fine."
Acolyte 1: "So, earth is the
planet making the shadow. I never thought of it that way. Thanks!! You're so smart!!"