I want to hear it now. Here's mine:

There was once a harpist who played in an orchestra. Every evening after a concert, several of the musicians would go out for drinks together to a favorite bar. The harpist would always order absinthe (which is a mild hallucinogenic) to drink. One night after returning home, he unpacked his harp, set it in its place in his living room, and prepared for bed. When he came back into the living room, something had changed — his harp had transformed from wood into something shimmery, almost scale-like. On closer inspection he found that the harp was covered with small, flat fish.

The next day, he told his friends at the orchestra about his experience saying "It's true what they say — absinthe does make the harp grow flounder".