Dr. Sheldon Cooper is Leonard's best friend, roommate, and co-worker at Calech. Sheldon is the smarter of the two with an IQ of 187, but is definitely the more socially awkward of two. He has a ridiculous ego, is extremely stubborn, but the group seems to put up with him.
Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.Sheldon
Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.