If anyone has NOT read it, I highly recommend reading Thomas Mann's short story: Die vertauchten Köpfe (available in English as "The Transposed Heads" and just $9 at amazon.com), which is a retelling of an Indian legend about a love triangle where two men's heads DO get switched, and what happens.
It's also used as an introductory allegory in the textbook Biological Psychology, 2nd Ed.