The crowd gasps. Sheldon’s eye twitches. He walks away, muttering about the arbitrary nature of constants. He locks himself in the boys’ bathroom and has what Mary will later call a "high-IQ hissy fit" and George Sr. calls "Tuesday."

Libby closes her locker. "Goodbye, Sheldon."

Libby smiles. "Only if I can challenge you on Thursdays. I have therapy on Wednesdays."