Quoting Sophia

"You say mice when there's more mouses than one. And you say octopi when there's more octopuses than one."

"I think that was the bug in my throat."
Explanation needed on this one: Sophia had a really bad cold, so I told her her symptoms were her body's attempt to get the "bug" out of her. A few days later she had the above epiphany when she saw a fly on our window.