When for some reason (weather, virus, fungus, shortage of partners)a plant or animal changes its sex. eg: Corn (it is suspectedthis is how modern corn came to be), frogs
Hey julie, guess what, you know our tank of all female frogs? well one of the girl frogs became a boy frog!
The psychological phenomenon of your mind turning a pretty mediocre song into a much better song when you recall the song from memory. Disappointment is guaranteed when you actually hear a song again.
Guy: This song sucks...I'm suffering from a case of aural transmutation!