Interesting study reported on CNN: link

Some mushroom derivative (a hallucinogenic) has been tested and most of the people who used it reported profound mystical/religious experiences of well-being that lasted up to months after the experiment.

I've never experimented, but I once had a friend tell me LSD had the effect of removing a veil from reality.

I guess the experiences can be very intense and not necessarily bright and sunny, so the researchers recommend you not try this at home. But maybe tonight's the night for an extra-large mushroom pizza.