
Well, if we accept your PREMISE and also
accept the highly improbable assumption...
The Big Bang Theory Season 1, Episode 17

Based on the PREMISE that
"lumen" sounds like "lemon"?
The Big Bang Theory Season 12, Episode 14

While I disagree
with the PREMISE of tenure...
The Big Bang Theory Season 6, Episode 20

It's based on the PREMISE
The Big Bang Theory Season 7, Episode 3

If you didn't cheer at my entrance,
it's too late to buy into the PREMISE.
The Big Bang Theory Season 3, Episode 4