TV series example of the word

The Big Bang Theory Season 1, Episode 1
No, it was a valid hypothesis.

The Big Bang Theory Season 8, Episode 21
That's actually a valid example.

The Big Bang Theory Season 10, Episode 19
That is a valid point.

The Big Bang Theory Season 2, Episode 23
Assuming that's a valid reason not to go, which it isn't...

The Big Bang Theory Season 8, Episode 2
A valid point, but unoriginal. B-minus.