I remember seeing a list of cracked passwords and one of the ones they got was !QAZ2wsx#EDC4rfv%TGB6yhn. It passes every single password strength checker and dictionary word checker in the world, and still gets cracked.
zxcvbn actually correctly identifies that password as being the result of the user hitting multiple adjacent keys on a standard QWERTY keyboard. Still passes the strength check though because it doesn't identify the more complex pattern of moving top to bottom, then left to right across the keyboard, alternating shift with every column.
