
Yeah, me, too. I was stuck for a METAPHOR.
The Big Bang Theory Season 9, Episode 12

I believe the appropriate METAPHOR here
involves a river of excrement...
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

They say it's the perfect METAPHOR
for my incandescent talent.
The Big Bang Theory Season 2, Episode 4

I believe the back-scratching METAPHOR
describes a quid pro quo situation...
The Big Bang Theory Season 2, Episode 16