You know, if this experiment is going to
be VALID, I suggest a neutral environment.
The Big Bang Theory Season 10, Episode 4
That is a VALID point.
The Big Bang Theory Season 10, Episode 19
Assuming that's a VALID reason not to go,
which it isn't...
The Big Bang Theory Season 2, Episode 23
...scientifically VALID protocol
that will make our lives better?
The Big Bang Theory Season 3, Episode 3
He makes a VALID point!
The Big Bang Theory Season 8, Episode 3