Bathtime.
Ezra: The water isn't high enough.
Me: It's fine. It'll get higher when you get in.
Ezra: What? Why?
Me: Because you guys will displace some of the water and the water level will be higher.
Ezra: Where did you learn that? Because wherever you learned it, that must be fiction.
Me: I learned it in school.
Ezra: Well I've been in school over 110 days and I've never heard that.