The Big Bang Theory: Progressively Harder Sheldon Cooper Knock Knock Quiz

by Aimee Klapisch
The Big Bang Theory Sheldon
CBS

15. On Whose Door Has Sheldon Never Knocked?

Raj

Mrs. Davis

Bert

Barry Kripke
Contributor

Aimee Klapisch hasn't written a bio just yet, but if they had... it would appear here.