
Don't try to change the SUBJECT.
The Big Bang Theory Season 6, Episode 9

I'll change the SUBJECT.
The Big Bang Theory Season 6, Episode 24

just maybe you can help
me change the SUBJECT.
The Big Bang Theory Season 11, Episode 12

- Can we please change the SUBJECT?
- Sure.
The Big Bang Theory Season 1, Episode 17

And also, while we're on the SUBJECT,
you recently changed your shampoo.
The Big Bang Theory Season 6, Episode 2