
Now, her COSTUME
was obviously Germanic...
The Big Bang Theory Season 2, Episode 2

Hey, why aren't you
in your COSTUME?
The Big Bang Theory Season 12, Episode 6

Yeah, now about those.
They came from a COSTUME shop...
The Big Bang Theory Season 8, Episode 22

So, what time
does the COSTUME parade start?
The Big Bang Theory Season 1, Episode 6

Except the Halloween COSTUME
The Big Bang Theory Season 7, Episode 2