UFOs
I would not be willing to say it's impossible, I really try to keep belief out of it, there is a considerable amount of evidence and while most of it is circumstantial or eye witness, a significant amount is difficult to simply dismiss...
I would tend to agree with you, either they are fake or absolute proof of unknown flying machines, that is the discussion I hope to have, and while it's difficult not to be a little bit humorous this has nothing to do with aliens building megalithic structures for humans.
Can you elaborate on why you think they are fake?