Regarding delusions and when a person see's something that is not there I would say if other people don't see what the person see's is then their own affair and as long as it doesn't harm the individual or affects others is harmless. .
So the person who saw the cat or beer were correct in what they saw and the problem was the people who could not see it.............:scratchin:this doesn't make much sense to me.....
My take would be if there is no step by step reasoning for it to exist and if no-one else can see it, hear it touch it etc then it isn't real or has no existance in reality the cat and beer were internaly created delusions....
Most people's belief's can be proved through step by step factual assertations they have made and generaly there are a number of people who share the same belief.......
Your beliefs are internaly created with no external possability for observation.So the question stands how can you base this as a likely possability of reality when there is no reasoning behind it, apart from egotistical comfort.
Is that bending time,stopping traffic with your mind,OBE'S,using the pyramids as a stargate or memories of the big bangI have only had one episode which I would put in this catagory and only I can decide whether it was a delusion, elusion or I was just hallucinating.