
I'm WARNING you.
Game of Thrones Season 4, Episode 5

I'm WARNING you, Sheldon.
The Big Bang Theory Season 6, Episode 9

Computer :
Warning. Control room breach.
Westworld Season 2, Episode 7

He said it's a WARNING.
Westworld Season 2, Episode 8

Put their heads on spikes
outside the stables as a WARNING.
Game of Thrones Season 2, Episode 9