
A time machine from a science-fiction show
has nothing to do with Halloween.
The Big Bang Theory Season 6, Episode 5

I see you're getting ready
for your Halloween party.
The Big Bang Theory Season 6, Episode 5

It was a harmless
Halloween prank. Look.
The Big Bang Theory Season 5, Episode 7

You know, I used to throw
Halloween parties all the time
The Big Bang Theory Season 12, Episode 6

Hey, happy Halloween.Oh!
The Big Bang Theory Season 12, Episode 6