He had caches of wildfire
HIDDEN under the Red Keep,
Game of Thrones Season 6, Episode 9
His kind, they've always got
something HIDDEN away somewhere.
Game of Thrones Season 4, Episode 1
The next clue
must be HIDDEN
The Big Bang Theory Season 7, Episode 3
She's HIDDEN.
Money Heist Season 1, Episode 4
Hidden inside our underwear?
Money Heist Season 1, Episode 13