Knife Storm

A knife storm appears in the episode "Rainy Day Daydream." It is similar to a normal storm, but it rains knives instead of water. It is apparently a rare occurrence, as Finn was amazed since he claimed to never have seen one before, (though Jake already knew what it was). Finn calls the Knife Storm "beautiful" right before Jake pulls him into the Tree Fort for shelter. After time, the knives evaporate from Morton's sword salt.

Trivia

 * The storm appears as a game feature in the games Finn and Jake's Epic Quest, Hey Ice King! Why'd you steal our garbage?, and Fionna Fights!.