Steven Poole has it right: believability is not a replacement for accuracy in language. How believeable is it? is a question for fiction writing workshops, wherein authors are creating a fiction. Writers manipulate language to get readers to suspend disbelief. Believability is a measure or a value for fiction, a deliberate artifice.
More about Poole’s Unspeak at Slate: Unspeak exposes the language twisters. You can contribute your own favorite (?) original examples.