There's no GUARANTEE our sperm's
going to generate high-IQ offspring.
The Big Bang Theory Season 1, Episode 1
Once inside, the only one
who can GUARANTEE you being free
Money Heist Season 1, Episode 11
...and I can personally GUARANTEE...
The Big Bang Theory Season 6, Episode 9
And, frankly, our first aid courses
weren’t a GUARANTEE for living."
Money Heist Season 1, Episode 5
And the very fact that you needed
a written GUARANTEE of respect
The Big Bang Theory Season 9, Episode 18