I should WARN you I have
a tongue piercing.
The Big Bang Theory Season 12, Episode 3
I should WARN you,
I've had quite a bit of wine.
Game of Thrones Season 2, Episode 3
As your brother,
I feel it's my duty to WARN you...
Game of Thrones Season 1, Episode 1
...someone called to WARN him.
Breaking Bad Season 3, Episode 9
All right, just WARN me before you do it.
The Big Bang Theory Season 10, Episode 8