
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

Playing Halo? Watching Battlestar?
Drop some Mentos in Diet Coke?
The Big Bang Theory Season 2, Episode 19

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

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