That is right. People see UFOs (Unidentified Flying Objects) all the time. The real question is are all UFOs explainable as some ordinary objects or occurrances or are some UFOs truly unknown objects of some type (alien spacecraft, unknown natural things such as Earth lights, etc.).
Actually saucer type objects are rare. Most objects actually observed have been cigar shaped, flying triangles, egg shaped, sphere shaped, etc.
Some of the best documented sightings took place in Belgium in 1990 when a lot of people observed triangle shaped objects. The Belgium Air Force chased the objects with F-16s and the government readily admitted that strange objects had been sighted.