I haven't done it, but I've heard someone doing it. I didn't think too much of it. But I have had some spiritual experiences, but I don't feel the need to elaborate on them unless someone really wants to know (and then they can PM me or something, I don't really mind too much I guess).

One slightly different thing I have heard of though is someone who started speaking in a different language. He'd been at our church for years, apparently, and didn't know what he was saying. Some other person was able to make out some of what he said, though. I don't remember what language it was, I was pretty young. But I thought that was pretty cool. I don't think they were able to make out everything, but some of it was in their language. I think that's the "weirdest" spiritual thing I've seen happen, though. But I have seen a few other weird things over 18 years of going to church.