Halo: Combat Evolved - right at the end of the training phase: (paraphrased for emphasis)
"Master Chief, the ship is on fire, disabled, being invaded by a huge coalition of hostile aliens, and on its way to crashing into a mysterious planet-sized artifact. We are in the middle of nowhere, and no help is coming. Here's our computer core. If the aliens get their hands on it, all of humanity will perish. All I can offer you in support is my ceremonial service pistol and one clip of ammo. But this is you I'm talking to, so I imagine everything will turn out fine."