There are all sorts of things people think are UFOs. Back in the late '70s I was babysitting the neighbor's kids, and suddenly their other neighbors came running over in a panic. They were absolutely sure there was a UFO in the night sky, and wanted me to confirm that (they knew I was babysitting that night and that even 40+ years ago I was an astronomy buff who regularly went stargazing).
This was in January, so we're talking winter skies. I went outside, looked at where they were pointing, and didn't see a UFO. I told them the night sky looked normal, so where was the UFO?
They pointed at one particular star that was the brightest and they said it kept changing color. That HAD to be a spaceship, right?
Nope. They were just freaking out because Sirius is the brightest star we can see at night, and it often does appear to change colors. But that's due to atmospheric conditions and how Sirius itself is. It's a binary star, really close, extremely bright, and people who aren't into stargazing sometimes think it's some bizarre thing that just has to be a UFO.
They kept saying, "Are you SURE?" and I told them yes, I was absolutely sure that it was just a star, it was behaving as it normally does, and there was nothing to worry about.