Quotes / Instant-Win Condition

Sakon: Oh no! Without Orochimaru's arms, we're sure to lose!
Jirobo: But our army outnumbers them thirty to....
Sakon: We're sure. To lose.
— Naruto: The Abridged Series

And suddenly, with the situation at its most bleak, with Garrett imprisoned and the only way out blocked by a horde of murderous hammerites determined to smash his skull, Garrett wishes himself out of the jail cell and escapes. As if by magic.
The Thief anti-walkthrough on IT-HE.org

Alpha strike: An all-out attack that would be suicidal if it weren't for the fact that it wins immediately.
MechWarrior fan name for this trope.

Victory! Of course, somehow finding the staff suddenly eliminates the fact that we're being smashed by large hordes of giant anthropomorphic pigs and we have no plausible escape route from the area we're in but whatever I win haha you all suck.
Let's Play Myth II: Soulblighter

Ender: The enemy's gate is down.

Exodia! Obliterate!

Take another turn after this one. You lose the game at the end of that turn. (You don't lose if you've already won.)