Completely believe in them....I've experienced spirit but not ghosts. I think there are so many dimensions we are not aware of and these dimensions are somehow entwined with each other but not all are aware of each other. I look at the quantum physics stuff and all of this stuff or try to understand it as much as I can. Even scientists are saying they think the dimensions are starting to 'clash' or are becoming closer together. There was one horizon programme I saw that once that explained it very simply. It's hard to put in words. They reckon if you are in a certain area at a point these dimensions 'collide' that's when some weird stuff can be seen/experienced ie. ghosts,time slips etc. Although it's not the same thing I believe animals can see ghosts/spirit as they may be able to see more light spectrum than humans can. One day ghosts/spirit and whatever will be scientifically proved...everything's entangled somehow.....and what's this 'black matter' all about....?