I don't believe it matters what the TOPIC is.
The Big Bang Theory Season 8, Episode 18
The football player.
How about we stay on TOPIC?
Breaking Bad Season 2, Episode 3
And on a different
but not unrelated TOPIC...
The Big Bang Theory Season 3, Episode 1
So, Alex,
what's the TOPIC of your dissertation?
The Big Bang Theory Season 6, Episode 3
Oh, and on the TOPIC
of sharing things that are yours...
The Big Bang Theory Season 8, Episode 7