Fog

Scene: Car at gas station, rain and heavy fog.
Mom and child (a little over 2.5 years old)

Child: "Mommy - my window broke"
Mom: "No honey, it just has rain on it"
Child: "But I can't see"
Mom: "Because of the water"
Child: "No, I can't see after the water"
Mom: "Oh, that's because its foggy out"
Child: "foggy?"
Mom: "Yes, foggy, see how all the clouds are down with us?"
Child (said dead seriously and a little too grown-up): "Mommy, Let's Get Out of Here!"