Hey, here's another possible TOPIC
of conversation.
The Big Bang Theory Season 4, Episode 1
So, Alex,
what's the TOPIC of your dissertation?
The Big Bang Theory Season 6, Episode 3
This is an interesting TOPIC.
The Big Bang Theory Season 4, Episode 1
Oh, yeah. Those guys can be
very stubborn. What's the TOPIC?
The Big Bang Theory Season 2, Episode 20
Not that my disinclination
to discuss the TOPIC...
The Big Bang Theory Season 4, Episode 7