
If there's no COSTUME parade,
what are we doing here?
The Big Bang Theory Season 1, Episode 6

He didn't remember me, because the last
time we met I was in a Halloween COSTUME.
The Big Bang Theory Season 2, Episode 14

PRIYA: I can't believe I'm wearing
my brother's Halloween COSTUME.
The Big Bang Theory Season 4, Episode 24

this is
a sexy French maid COSTUME
The Big Bang Theory Season 5, Episode 21

Sheldon, when I said couples' COSTUME,
I meant, like, Romeo and Juliet...
The Big Bang Theory Season 6, Episode 5