The party is always one experience point away from leveling up, and something always goes wrong. Verse 1: they kill a goblin captain but the DM recalculates and they're 1 XP short. Verse 2: they find a 1 XP rat but miss their roll and the rat escapes. Bridge: a comedic list of epic feats already accomplished - yet still one point short. Outro: the DM reveals they actually leveled up three sessions ago.
