As a video game programmer, let me just say… BRING IT!!!
But I have a few of these myself, back from my days as a civilian.
(1) In the old PC game Battletech: The Crescent Hawk’s Inception, the game starts with you in a training mission in a powerful mech called a “Chameleon”. This teaches you controls and so forth. While you’re in the training arena, your happy base is suddenly attacked, and an overwhelmingly powerful force of bad mechs descends on you in your chameleon, blows it up, and you are left on foot, to begin the story/quest.
However, the first time I played the game, I saw the powerful force descending upon me, so I just turn and ran. Normally, you can’t escape from the training arena, but when the powerful force descended, they also blew the arena to smithereens, leaving big gaping holes in the walls. Now, those holes were supposed to be set up so that you couldn’t actually quite escape through them, but I didn’t know that, and I just randomly found a way out. So I started the game with a super-powerful mech that was supposed to be available only in training mode, instead of on foot.
(Later on, I came back and tried over and over and over again and finally actually beat the overwhelming force. But it was hard.)
(2) In Golden Axe 2, there’s a very nasty boss fight against a big grim reaper guy. When the fight starts, he has 4 fairly weak shambly straw golem flunkies, so you’re fighting him plus them. When you kill all 4 of them, he summons up 4 nasty skeleton flunkies. They are MUCH tougher. So I eventually learned to leave the last straw golem alive, thus killing him without ever having to face the skeletons.
(3) In Ghouls ‘n’ Ghosts, you can rack up infinite score by replaying the final level over and over again without picking up the magic weapon, because only with the magic weapon can you go through the last door and fight the final boss.