To ascribe the faucet to ghosts is irrational. You might just as well ascribe it to goblins, gremlins, squirrels, falling space junk, unicorns, sasquatch, yeti, chupacabra, wind gusts, angels, the Virgin Mary, I don't know, pick your poison.
Why ghosts? Why anything supernatural? You don't know and neither do we. We cannot explain it and we're content with that. That's science, brother.
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