No time to make up my own right now, but my personal fav was one I first heard many years ago on the '70s British comedy Are You Being Served:
On the chest of a barmaid from Sale
was tattooed all the prices of ale
Whilst on her behind,
for the sake of the blind,
was precisely the same but in braille.

(It's better to watch it... at about 13:00 in this video)