Season 1, Episode 16 – "Killer Asteroids, Oklahoma, and a Frizzy Hair Machine"

"He said my hair looks like a frizzy machine."

Sheldon quickly befriends a student named Shavawn (Macy's Lei McCash), who shares his interests. However, their interaction is cut short when Sheldon accidentally insults Shavawn's history teacher. The incident propagates, causing tension between Sheldon and the teacher.