Luckily for you,
that's where the METAPHOR ended.
The Big Bang Theory Season 1, Episode 15
It's a sports METAPHOR.
The Big Bang Theory Season 2, Episode 7
I believe this is an extension
of the death METAPHOR.
The Big Bang Theory Season 2, Episode 8
I believe the back-scratching METAPHOR
describes a quid pro quo situation...
The Big Bang Theory Season 2, Episode 16
I believe the appropriate METAPHOR here
involves a river of excrement...
The Big Bang Theory Season 2, Episode 8