Amy Farrah Fowler: Who's Tam?
Sheldon Cooper: He was my best friend in the whole world growing up.
Amy Farrah Fowler: Really? Why have I never heard you mention him before?
Sheldon Cooper: Oh, of course I have. I'm sure I've mentioned him, like, five times this week.
Amy Farrah Fowler: I don't think you have.
Sheldon Cooper: Tam! Tam! Tam! Tam! Tam! There, it's only Thursday.
Amy Farrah Fowler: I didn't just drink the crazy milk, I bought the crazy cow.