Just look to the tradition for models. You'll never go wrong!!

My sweetheart's a mule in the mines,
I drive her without any lines,
On the bumper I sit
And tobacco I spit,
All over my sweetheart's behind!

or...

If you've never been in love with a landlady's daughter,
Then you cannot have another piece of pie!

(Just a few short ones!)

Or...

There was an old lady who loved a swine,
Honey--said she,
Piggy dear, "will you be mine?"

"SMORT" said he!!

Art Thieme
(try "Froggy Went A-Courtin'" too. ;-)