Hannah: Mommy, I stuck my nose in there [the cupboard under the sink, where we keep the garbage] and it STINKS!
Me: Well, Hannah, it’s because you’re smelling the garbage. Of course it smells bad.
Hannah: REALLY bad.
Me: It’s sort of like sticking your head in the toilet.
Me: Right. It’s like sticking your head in the toilet and taking a big sniff. Do you think it’s going to smell like flowers?
Hannah: NO! [Thoughtful pause] The garbage doesn’t smell like flowers, either.
(The powers of observation are great with that one.)