Howard thought it'd be funny
to tell me it was a COSTUME party.
The Big Bang Theory Season 9, Episode 21
Yeah, so the judges can give out
the prizes for best COSTUME.
The Big Bang Theory Season 1, Episode 6
So, what time
does the COSTUME parade start?
The Big Bang Theory Season 1, Episode 6
If there's no COSTUME parade,
what are we doing here?
The Big Bang Theory Season 1, Episode 6
She may have heard about
my cool Dumbledore COSTUME.
The Big Bang Theory Season 10, Episode 17