For the experiencer, it's confirmation that they are not crazy after all.

For the nonexperiencer, it's confirmation that the experiencer is crazy. LOL

Seriously, though, I don't feel a need to tell other of my experiences, unless it's in a serious conversation with someone else who has their own experiences and needs to sort it out. Otherwise, there's really no proof I can offer of what has happened to me. I know it's real, and that's enough for me.