
If you've ever puzzled your way through sheet music at any level, you'll appreciate the horrible complexity of the following impossible compositions.
Nevermind that many of the passages cannot be played by a ten-fingered person; check out those performance instructions: "Untie slip knot," "like a dirigible," "release the penguins," "continue 'swimming' motion" and so forth.
"Faerie's Aire and Death Waltz" (based on a Cro-magnon skinning chant)
(thanks, manny)