Except the Halloween costume
The Big Bang Theory Season 7, Episode 2
...since this is our first Halloween
party as boyfriend and girlfriend...
The Big Bang Theory Season 6, Episode 5
It was Halloween.
The Big Bang Theory Season 12, Episode 6
[imitating Bernadette]:
Happy Halloween.
The Big Bang Theory Season 12, Episode 6
We're showing
Sheldon Halloween.
The Big Bang Theory Season 12, Episode 6