Natural 20
The climax of almost every "I did something awesome, guys!" story on /tg/. A natural 20 is when you roll 20 on a 20-sided die (most commonly used by Dungeons and Dragons). In almost every system this is a critical success, meaning that whatever you did happens without question, even if it should be impossible for you to do based on your skill scores or stats. As such, it's a convenient way for an OP who's completely telling the truth about how the story went to make it go the way he wants.