This is an interesting TOPIC.
The Big Bang Theory Season 4, Episode 1
Very controversial TOPIC.
The Big Bang Theory Season 5, Episode 3
May I suggest it
as the TOPIC for your essay?
The Big Bang Theory Season 2, Episode 13
So, Alex,
what's the TOPIC of your dissertation?
The Big Bang Theory Season 6, Episode 3
Have you noticed Howard can take any TOPIC
and use it to remind you he went to space?
The Big Bang Theory Season 6, Episode 5