Why Wouldn't I?

One of the twins, KChung & KChuen: "Teacher, guess who I am."

Both are standing in front of my desk by now, coming over from their respective seats.

Me: "Let me see," moving my occipitofrontalis & corrugator supercilii muscles.

"You are KChung," eyeing one and "You are KChuen" looking at the other.
KChung & KChuen: In chorus, " How do you know?"