I did one ages ago for the Gilbert & Sullivan "Modern Major General" patter song. I didn't save it and don't remember it. However, some of it went:
I am the very model of a modern major genital,
Strong and sturdy, sleek and ?
Later in the song, I used the lines:
He is well known around the town for endless copulation,
'Cause I keep going in and out in perfect operation.
Feel free to crib, but PLEASE do not give me credit.
I also did a kosher green eggs and ham spoof that is far more family friendly. That one is floating around the Internet.
BTW, Star Trek the Next Gen used the "Send in the Clones" line.
Audrey, the Phantom Phanatic, who nonetheless would rather be Jean Valjean, who knew how to make lemonade out of lemons.