Incognito. Someone in my local congregation did just that and was never disfellowshipped, or reproved (As I know, it may never have been publicly announced, but I doubt disfellowshipping was ever done, as we were still allowed to speak to that someone)
I also think it does also depend on certain congregations, and Elders (sometimes). This is where I think the power gets to their heads and they abuse it, but the Governing Body does have a lot to say in what they do, and how they go about with the so-called "Loving" help (Or cruel punishments as I call it).