Double Haunting, upset the applecart?

I'm another non double haunt goo stealing believer I'm afraid. I've visited SF's to see houses haunted that you can't double tap, a bit like the gremlins, it tells you whose haunted it and shows there user names, however these double taps are haunted by 'The Ghosts'. I've also noticed that not every SF has these infamous double haunting a but does have haunting a you can't touch. So where did this myth start & where is the evidence to say double tappings cause others to lose goo. I'm just curious because to top it off I've actually seen 'The Ghosts' haunt my own SF and I get double goo off them too, however they are not an often occurrence. I think these 'The Ghosts' haunting a aren't other users but a set like maybe just maybe it's the 'other SF' doing the haunting.