Although some people on here claim to have experienced astral projections and OBE's, I'll have to be a bit more sceptical. I can bring myself to believing in lucid dreams, as that sounds fairly plausible, but the idea of your spirit (which I don't believe in anyway since I'm an atheist) actually leaving your body yet still attached by a thin thread, travelling to other dimensions and fighting with evil demons, sounds utterly ridiculous to me.
I will never be able to believe in OBE's unless I either experience them myself or some scientist somehow comes up with a credible scientific explanation for them. People claiming to have experienced OBE's will never be able to prove them as anything other than a delusion, and to an intelligent logical person with no personal experience of them, OBE's sound no more probable than the existence of the Easter bunny.
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Lucid dreaming, astral projection, out of body experiences, etc.