rationalskepticism.org

I guess that`s the difference between the two of us, the bit on preferring a hallucination over photographic evidence. Though, you`re as likely to detect a ghost or whatever disembodied spirit of a corpse from said abandoned graveyard with a camera as you are to get the truth out of houseplant`s perception (debunked Backster`s effect) through a polygraph. If your brother can`t or anyone else reproduce the same experience by cowering away from it, most paranormal believers will then find this ambiguous element from said event as a token of verisimilitude of their paranormal experience, thus conditioned to believe it rather than note it as a collective hallucination.