Have you ever heard or been to a live funeral?

A group of us were talking about a friend of ours who will have to be buried soon and someone shared an idea he read about that was a live funeral. You go ahead and have a funeral for the person who is going to die but they get to go to their own funeral and see what everyone says about them and how many flowers were sent etc. Then I guess when the time comes they just get buried as usual. Anyone heard of this and what are your ideas on it?