The reliability of the senses, perception, and memory has long been the subject of debate. A great many thinkers have weighed in with their opinions on these essential functions of the brain. Science is currently expending enormous effort in making experimental assessments. A lot is at stake. It is vital that we know just how far we can trust our innate abilities to collect information about the world around us. We need to know how well we convert sensory data into basic concepts (tree, rock, person, and so on). We must also have some idea of how well we remember those reflexive perceptions once we have formed them.
UFO or cloud? It is foolish to be uncritical of your own experiences; you must make them a matter of conscience and knowledge. How you choose to interpret and remember the experience does matter.