
It was sparsely sourced,
but I think the science is VALID.
The Big Bang Theory Season 1, Episode 3

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

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

That is not a VALID order.
Game of Thrones Season 6, Episode 8

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