
The Star Trek REFERENCE
and the play on words...
The Big Bang Theory Season 2, Episode 22

...you'd be in a non-inertial
REFERENCE frame and would...
The Big Bang Theory Season 1, Episode 3

And for future REFERENCE,
it's this.
The Big Bang Theory Season 5, Episode 12

Is that a REFERENCE
to my speech impediment?
The Big Bang Theory Season 7, Episode 10

For future REFERENCE,
if I want to watch Mean Girls,
The Big Bang Theory Season 9, Episode 11