Don't look down if you're SUBJECT
to vertigo... and use their stairwell.
The Big Bang Theory Season 1, Episode 14
DR. KOOTHRAPPALI:
Okay, we're getting off the SUBJECT.
The Big Bang Theory Season 4, Episode 20
Nothing happened.
Can we change the SUBJECT?
The Big Bang Theory Season 4, Episode 9
Love you, love the hair,
would love to change the SUBJECT.
The Big Bang Theory Season 10, Episode 9
Don't try to change the SUBJECT.
The Big Bang Theory Season 6, Episode 9