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("POP GOES THE WEASEL"
PLAYING ON BOX)
The Big Bang Theory Season 6, Episode 21

I was only being polite.
Pemberton is a grade A WEASEL.
The Big Bang Theory Season 12, Episode 21

Why do you say he's a WEASEL?
The Big Bang Theory Season 12, Episode 21

("POP GOES THE WEASEL"
PLAYING ON BOX)
The Big Bang Theory Season 6, Episode 21
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("POP GOES THE WEASEL"
FINISHES PLAYING ON BOX)
The Big Bang Theory Season 6, Episode 21