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

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

Yeah, for future REFERENCE,
that's a while.
The Big Bang Theory Season 7, Episode 15

What?
You're familiar with the REFERENCE?
The Big Bang Theory Season 10, Episode 7