Big No/Tabletop Games


 * The Mystara supplement The Five Shires actually turns this trope into a defensive weapon for classic D&D halflings. Within the boundaries of their homeland, halflings threatened by spells can cry "No!" once a day, sacrificing some of their life force in the process, and potentially negate the impending spell's effects. Things like this happen when Ed Greenwood writes your gaming material....
 * Every gamer ever after a high level, carefully munchkined, self inserted, or valued for some other reason character dies. For best results, have them role a one, resulting in falling on their own sword. Or quarterstaff.