Diet Coke.
The Big Bang Theory Season 1, Episode 13
His DIET is rich in fatty deli meats.
The Big Bang Theory Season 6, Episode 9
"Wil, do you want more Diet Coke?
The Big Bang Theory Season 8, Episode 20
This thing has to hold up
against a hearty potato-based DIET.
The Big Bang Theory Season 2, Episode 22
- Is it DIET?
- That's what you ordered.
The Big Bang Theory Season 4, Episode 23