Happy Halloween.
The Big Bang Theory Season 1, Episode 6
You know, like how I practiced
for that Halloween haunted house
The Big Bang Theory Season 10, Episode 6
...since this is our first Halloween
party as boyfriend and girlfriend...
The Big Bang Theory Season 6, Episode 5
I dressed up as
him for Halloween.
The Big Bang Theory Season 5, Episode 21
Halloween traditions
The Big Bang Theory Season 12, Episode 6