UFOs have been seen all throughout time, but I'm gonna start with the classic, actually the beginning of the classics. June 24th 1974 Kenneth Arnold was a pilot and had given up searching for a downed U.S. Marine Corps C-46 transport airplane that had crashed near Mount Rainier for the $5,000 reward. Heading eastward, over Yakima, he spotted a series of flashing lights north of Mount Rainier. He ruled out it being another airplane by rocking his airplane from side to side, removing his eyeglasses, later rolling down his side window, and it couldn't have been a flock of geese by the altitude. The objects quickly approached Mount Rainier and then passed in front of it, usually appearing darker in profile against the bright white snowfield covering the peak, but occasionally still giving off bright light flashes as they flipped around erratically. Arnold reported at times the objects appeared so thin and flat, they were practically invisible.
Arnold likened their movement to saucers skipping on water, and the news the following day first used the coined term, "flying saucer", though Arthur himself did not use that exact wording. To his calculations, the objects were moving at 1,200mph, still faster than any known aircraft, which had yet to break the sound barrier. Several people corroborated his story, like a woman named Ethel Wheelhouse reported sighting several flying discs moving at fantastic speeds. The news ran wild with this story and reporters assessed Arnold as highly-credible when they interviewed him at length. He seemed to be neither exaggerating what he had seen, nor adding sensational details to his report. He also gave 
the impression of being a careful observer. Some placed a religious interpretation on his sighting, but others suggested the discs were visitations from another planet. The story had been front paged the next days, and the first images of the saucers surfaced.
In the weeks that followed Arnold's June 1947 story, at least several hundred reports of similar sightings flooded in from the U.S. and around the world. Most of which described saucer-shaped objects, starting off the 1947 disc craze. Many would say that people are just jumping onto the fad, and that the thousands of following sightings are hoaxes, but I'd like to think of it the other way around. Maybe those 9 UFOs
were the first to come swoop down to Earth, and their stories of what they saw just made Galactic headlines, starting a craze of aliens to jump onto the fad and visit Earth to see what all the fuss is about. They might not like what they saw, with all the WWII stuff y'know happening and atomic weapons being developed as a part of the Manhattan Project, but I'd be damned if they weren't intrigued. There could be a gray up there writing about the "Earth craze of 1974" as we speak.
The quick brown fox jumps over the lazy dog
The quick brown fox jumps over the lazy dog