Touhou Labyrinth/YMMV


 * Breather Boss: Pretty much every boss on the 19th floor, given what you had to go through on the 18th.
 * Goddamn Bats: Any random enemy with absurdly high speed, due to how the game punishes you for finishing a fight with less than full health.
 * That One Boss: Numerous examples, varying from player to player.