Child: I LOVE THOMAS!
Me: Who's Thomas?
C, holding up a small toy: THOMAS THE TRAIN!
M: Well, that's technically not a train. A train is a series of connected railway cars with an attached locomotive. What you have there is a tank engine. (patronizing chuckle) I'm surprised you didn't know that.
(Child pauses to examine toy.)
C: I LOVE THOMAS!