Oh. You MUST be one of those
The Big Bang Theory Season 10, Episode 24
Game of Thrones Season 1, Episode 2
It can't be. There MUST be something.
Look for it!
Money Heist Season 3, Episode 8
Now I MUST flee,
Game of Thrones Season 6, Episode 6
and then you would say,
"If you MUST invoke an imaginary deity,
The Big Bang Theory Season 10, Episode 20