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
...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
"Wil, do you want more Diet Coke?
The Big Bang Theory Season 8, Episode 20