Statistics plays no real role in it. If you view the universe as an infinite body, which we believe not to be true, then there is an arbitrarily small chance of being proven wrong.
The ocean is constant as well. Sea monsters as we know from mythology have little chance of being fact. We have found giant squid before, but nowhere near as giant as they would call the sea creatures. You can roll numbers all day, but there is no real certainty.

Yes. I see them all the time. They're horrible creatures. They usually stand between 4 to 7 feet tall on two legs, have two arms, each of which have five miniature tentacles. They have this ugly scaleless, featherless, and (mostly) hairless flesh. And the voices...oh God, the voices! They open their mouths and from their pits of darkness come terrible, terrible words! They talk about football, boys, hot girls they want to bang, what they saw on TV, and the weather!

I try to tell everyone about them, how they've flooded the world, how we have to stop them before it's too late. But nobody believes me. NOBODY!

Little chance of being fact?

The Kraken is real. To a large extent. Giant squid. (Unless 40 feet is unimpressive to you)

You might want to take drop bears out of that list. The entire idea of a drop bear is a joke. I don't believe in any monsters like Nessy and Bigfoot.
It's the colossal squid that is the big one. The giant squid isn't that giant.