Subject to entropy,
decay and eventual death.
The Big Bang Theory Season 4, Episode 3
Is it me or are you purposely
changing the SUBJECT?
The Big Bang Theory Season 10, Episode 7
I've been accepted as a test SUBJECT
for a drug...
The Big Bang Theory Season 1, Episode 15
Don't try to change the SUBJECT.
The Big Bang Theory Season 6, Episode 9
Nothing happened.
Can we change the SUBJECT?
The Big Bang Theory Season 4, Episode 9