was an obvious REFERENCE
The Big Bang Theory Season 7, Episode 3
That is a cleverly veiled REFERENCE
to Howard's lifelong obsession...
The Big Bang Theory Season 6, Episode 9
I'm surprised you know that REFERENCE.
The Big Bang Theory Season 8, Episode 19
...you'd be in a non-inertial
REFERENCE frame and would...
The Big Bang Theory Season 1, Episode 3
What REFERENCE?
The Big Bang Theory Season 8, Episode 19