That specific quote irks me as well. I mean, a good film quote is the kind of thing you can bring into everyday conversation in a relevant and amusing manner. But "my name is Inigo Montoya, you killed my father, etc" is always going to sound strange out of context. So why does everyone insist on saying it all the freakin' time?
And the whole inconceivable thing? Is that supposed to be funny, or what? And I'm pretty sure it does mean what he thinks it means.