
Sheldon, Halo night, Koothrappali's.
You coming?
The Big Bang Theory Season 2, Episode 6

So all he does is sit in his bubble
and play "Halo" 24/7.
The Big Bang Theory Season 1, Episode 16

Wednesday's Halo night.
The Big Bang Theory Season 2, Episode 6

...if you would be the fourth member
of our "Halo" team.
The Big Bang Theory Season 1, Episode 7

Do I have a HALO?
Breaking Bad Season 5, Episode 8