All I've ever heard is the first line, please finish this:

There once was a man from Nantucket,
?
?
?
?


Thanks,
-Chuck, Vegetarian fanboy

Google

There once was a man from Nantucket
Whose cock was so long he could suck it
He said with a grin
Wiping sperm from his chin
If my ear was a cunt I could Fuck it!

Every time I read that I think of Judge Smails reading that poem in Caddyshack.