Oh, he's not coming out
until he sees PROOF
The Big Bang Theory Season 7, Episode 17
It's PROOF of concept.
The Big Bang Theory Season 9, Episode 24
Which is why I'm coming to you.
I need PROOF.
Game of Thrones Season 3, Episode 4
{\i1}That's the irrefutable PROOF of my love,{\i0}
Money Heist Season 3, Episode 4
I want a PROOF of life of each hostage,
Money Heist Season 1, Episode 9