
I believe this is an extension
of the death METAPHOR.
The Big Bang Theory Season 2, Episode 8

You know what? I'm thinking Howard
wasn't making a back-scratching METAPHOR.
The Big Bang Theory Season 2, Episode 16

Not a METAPHOR,
not an analogy,
it's a...
Breaking Bad Season 2, Episode 10

Luckily for you,
that's where the METAPHOR ended.
The Big Bang Theory Season 1, Episode 15

I believe the appropriate METAPHOR here
involves a river of excrement...
The Big Bang Theory Season 2, Episode 8