That's actually a VALID example.
The Big Bang Theory Season 8, Episode 21
A VALID point, but unoriginal. B-minus.
The Big Bang Theory Season 8, Episode 2
Assuming that's a VALID reason not to go,
which it isn't...
The Big Bang Theory Season 2, Episode 23
...where a tray of flatware
on a couch is VALID?
The Big Bang Theory Season 1, Episode 2
It was sparsely sourced,
but I think the science is VALID.
The Big Bang Theory Season 1, Episode 3