Guess you learn something new everyday...
Apprently Carnival has s1 owner's suites on the Fantasy class ships- here's the catch, you have to 'fill out a questionaire' about yourself for them to even give you or your customer pricing! Then they tell you if you qualify to book the cabin....The funny thing is, they don't show up on deck plans.
Here's an example on a website, look at the cabin lay out and all you see is a gray area Sensation

The cabins look really cool from what I've seen ..... here's a youtube tour

Anyone get lucky enought to get one of these free upgrades?