From my resarch, pirates have always favoured rhyming in their general vernacular. Aside from additions in their syntax (argh becomes AAAARGH!), many pirate songs rhyme. For example, there is that popular pirate tune whose first stanza starts as:
"I went up top to swab the deck,
I then saw the capn was a wreck,
He'd been drinking the briney tar,
Now his eyesight don't go very far"
Then there's the tune about the first mate and the parrot, but how many words can rhyme with "$!#!#@@@"?
Still, "The Princess Bride" is a good movie. When I get married, I want it playing on huge TitanTron monitors in the church. Man, that would kick.