
On Halloween.
On this couch.
The Big Bang Theory Season 12, Episode 6

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

Halloween traditions
The Big Bang Theory Season 12, Episode 6

LEONARD: I can't believe you think
he only wears it on Halloween.
The Big Bang Theory Season 4, Episode 24

For Halloween. Raj was Aquaman.
The Big Bang Theory Season 12, Episode 24