
...while Howard threw up
Red Vines and cherry Coke.
The Big Bang Theory Season 4, Episode 20

Diet Coke.
The Big Bang Theory Season 1, Episode 13

How hard is 65% Coke,
35% Diet Coke?
The Big Bang Theory Season 12, Episode 23

Diet Coke, please.
Breaking Bad Season 2, Episode 11

Sure. Take a Diet Coke, thank you.
Of course.
Breaking Bad Season 4, Episode 7