Diet Coke.
The Big Bang Theory Season 1, Episode 13
...while Howard threw up
Red Vines and cherry Coke.
The Big Bang Theory Season 4, Episode 20
Diet Coke, please.
Breaking Bad Season 2, Episode 11
"Wil, do you want more Diet Coke?
The Big Bang Theory Season 8, Episode 20
Sure. Take a Diet Coke, thank you.
Of course.
Breaking Bad Season 4, Episode 7