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

He makes a VALID point!
The Big Bang Theory Season 8, Episode 3

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

...where a tray of flatware
on a couch is VALID?
The Big Bang Theory Season 1, Episode 2

That was a VALID hypo...?
What is happening to you?
The Big Bang Theory Season 1, Episode 1