Sheldon is a very smart man, and
he obviously wants to keep this a SECRET.
The Big Bang Theory Season 6, Episode 8
How can I promise to keep a SECRET
if I don't even know what it is?
Game of Thrones Season 8, Episode 4
Carried out in SECRET,
unacknowledged,
Vikings Season 1, Episode 1
Your SECRET is safe with us, my lady.
Game of Thrones Season 4, Episode 8
You... Now you're asking me
to keep a SECRET from my best friend...
The Big Bang Theory Season 6, Episode 2