Would that be short for Unidentifiable Fried Object? Then yes, I've been served them. UFOs I suppose are possible. If we had enough technology and we discovered other life - and there MUST be other life, the universe is too vast not to have it, we would send probes to watch them and send info back. They could be like us and not be able to send lifeforms to make contact because they are too far away to survive the trip. If they did make contact, there is no reason to just assume that they will be friendly and show us new technologies. It would be more likely that we could be food or a new planet to inhabit to advance THEIR species.
The reason why a "missing link" has never been found is because there is none. We were created, literally. In their image. Not interested in opening the religious can of worms, but it fits. Only question left is whose image. Word has it we don't get to find out till we die. Good luck