Quidditch Rules

Refers to any competition or game, official or otherwise, where there is one task that has a significantly disproportionate effect on the scoring; Especially where this single task has a huge luck element to it.

This term originates from the rules of Quidditch, a sport in author J.K. Rowling's fictional world of witchcraft & wizardry, in which there are multiple ways to score a handful of points, but the if a seeker catches the Golden Snitch –an action that immediately ends the game– they receive 15x a normal scoring point in the game, thus almost always securing the victory even if they were significantly behind in the rest of the game.

We worked our butts off to score well all semester, but the professor pulled some Quidditch Rules bullsh*t and gave the team who did best on last week's assignment 15x the points of all the other assignments, so the team in last place won.