Is that a REFERENCE
to my speech impediment?
The Big Bang Theory Season 7, Episode 10
Yeah, for future REFERENCE,
that's a while.
The Big Bang Theory Season 7, Episode 15
was an obvious REFERENCE
The Big Bang Theory Season 7, Episode 3
...you might wanna skip the REFERENCE
to bowel movements.
The Big Bang Theory Season 1, Episode 1
What REFERENCE?
The Big Bang Theory Season 8, Episode 19