Steel trap

We were driving through town.  Several months ago, while running errands on that street, we saw one of Sierra's preschool classmates, Billy, out with his mom.

As we drove down the same road, Sierra said, "Where does Billy live?"

Me: "I'm not sure."

Sierra: "I wish we could see Billy get in his car."

Me: "Oh.  You remember when we saw Billy out with his mama."

Sierra:  "Yeah.  Billy got in his car with his mama."

(pause)

Me: "How do you remember everything?"

Sierra: "Weeeelll ... (long pause) ... I'm very intelligent.  And!  I love my friends."