^That is a stance I absolutely agree with! I felt it especially strongly during the recent FTL neutrino commotion. Though (rightly) cautious, I couldn't help but be excited at the possibility that we might be so wrong. What a thrill it would have been had those neutrinos actually been FTL!
I would be equally thrilled at an actual ghost or spirit, because of all the magical ideas we possess, I think the one I most wish were true would be an afterlife. Actual evidence for any sort of spirit or energy, or that the consciousness could survive without the living brain would be glorious. As it stands now, I see no reason other than fear or comfort-seeking to believe in that.
The other biggie I would really like to see, and the one that seems to have the most going for it in terms of odds, is aliens. I don't think any of the UFO sightings or alien abduction stories are true (they're all far more easily explainable as everyday phenomena like we've been discussing), but it sure would be awesome if we found them, even if they're only bacteria!
ETA: And as if in response to the shaking up of Relativity by the FTL neutrinos, researchers may have spotted gravity waves! COOL! http://www.bbc.co.uk/news/science-environment-19408363
Oh yeah, the potential FTL neutrino discovery was exciting. Perhaps a surprise nearly on the order of seeing a real ghost! Appropriate for a ghostly particle with nearly no mass!
But, I loved how the scientists handled it. They didn't announce it as a discovery but instead asked others to come in to try to figure out what mistake they could've made. Eventually, someone found the solution. But, that should be standard procedure anytime something extraordinary apparently occurs!
Agree that of the things you mention, alien life is the most likely. I wonder how different aliens would be if they were fairly similar to us except that they didn't have the fallible memories and perceptions that we have. Maybe they're no smarter but they never misremember, make things up, or incorrectly perceive things?
Mr Awe