Not sure when, i think they had some demon's possessing lookalikes, there may have been some illusions. pretty sure both have been possessed a few times. hell dean was possessed by a friggin vampire that one time.

ah and you meant the word vice sounds like weiss. i thought you meant weiss acted a lot like a character named vice.
i get it. cool coincidence. I do play him based on the 7 vices. mostly have pride and lust down so far :P