I firsthand experienced a charismatic Christian telling me a story about how one time his car wouldn't start, and then some stranger appeared to help him get it started again, and then once the car was running the stranger was gone – totally believable, everyday occurrence, except for my interlocutor's insistence that the stranger wasn't a human being, but actually an angel sent by God appearing in human form.
I wonder what that random stranger would think if he knew he's been turned into an angel in the mind of the person he helped.