I challenge you to find a single REFERENCE
to Kryptonian skin cells.
The Big Bang Theory Season 1, Episode 2
...you'd be in a non-inertial
REFERENCE frame and would...
The Big Bang Theory Season 1, Episode 3
That is a cleverly veiled REFERENCE
to Howard's lifelong obsession...
The Big Bang Theory Season 6, Episode 9
The Star Trek REFERENCE
and the play on words...
The Big Bang Theory Season 2, Episode 22
I'm surprised you know that REFERENCE.
The Big Bang Theory Season 8, Episode 19