Leonard: Welcome! Don’t mind Sheldon’s whiteboards.

Sheldon: Actually, mind them. Do you understand the roommate agreement?

Penny: Ignore him. Hi, I’m Penny! You don’t need to know science to hang out.

Howard: But if you do, I’m a space engineer, no big deal.

Raj: And I’m Raj. Dogs? No thanks. People? Yes, please!

Sheldon: Enough. Are they here to disrupt our balance?

Leonard: Relax, Sheldon. Join in—it’s fun here!