The theories expounded on by Hunt are the subconscience's suseptibility to spiritual hijacking (so to speak) during drug induced trances OR hypnosis OR even meditative trances in the quest to "see God."
BTW, your "supernatural" example of the Oracle of Delphi's ethylene gas booby trap is reminiscent of that scene from the 'Mummy', isn't it?
That could be interesting. I don't remember the scene from The Mummy though.