
...and I can personally GUARANTEE...
The Big Bang Theory Season 6, Episode 9

What better GUARANTEE
could you have
Game of Thrones Season 7, Episode 3

And, frankly, our first aid courses
weren’t a GUARANTEE for living."
Money Heist Season 1, Episode 5

There's no GUARANTEE our sperm's
going to generate high-IQ offspring.
The Big Bang Theory Season 1, Episode 1

I can pretty much GUARANTEE it.
I wish I had your certainty,
Breaking Bad Season 5, Episode 15