I heard this in 6th. grade in Palestine, Tx in 1963. The version was a "Little Johnny" joke (Little Johnny being a perennial grade school Till Eulenspiegel). To try and get Little Johnny involved in school activities, they appoint him a script coach for the leading man in the school play. The night of the play, the good kid comes down sick right at the epilogue, and Johnny, protesting futilely and scared out of his wits, is put in costume and shoved out on stage to deliver the last lines. The lines are : "Hark I heard a pistol shot! There she lay with hope in her soul. I snatched her up and carried her to my castle in the North Country. This was a play by William Shakespeare. Good night ladies and gentlemen". What came out was: "Hark, I heard a possum fart! There she lay with soap in her hole, I grabbed her by the snatch and carried her off into the boondocks. This was a play by William Snakeshit. Oh shit ladies and gentlemen I never wanted to do this in the first place!!"