Ready for a creepy story? Once, an experienced pilot named Fred Valentich was flying over Australia's Bass Strait, when he saw something. We, in fact, have his last words on record, as he called the Melbourne Air Flight Service after seeing something odd above him. The pilot calls in and asks if there's any other "traffic" in the area. After being told there is none, he reports seeing a large aircraft passing over him. He says it's going incredibly fast, "playing some sort of game." He says he can't confirm what exactly it is and, shortly before he disappeared, said, "It's not an aircraft. It is –" before cutting off abruptly. He then said it's a flying ship that eventually began orbiting above him. His last words were, "It is hovering, and it's not an aircraft." After that, he was never heard from again.
Now, of course, there are some out there eager to debunk it, claiming that what the pilot saw was merely the bright light of Venus. Their idea goes that he saw a bunch of stars and then hallucinated a space ship between them, because apparently that's what happens when you look at Venus. You know, we've heard of Venus being used as the explanation for aliens before. The documentary Men In Black described the phenomenon best of all.
So, yes, there's a chance that this was actually an experienced pilot seeing some stars, and then literally imagining a spacecraft in between them, before somehow mysteriously disappearing without a trace and … okay, you know what? In this case, "aliens" is the less ridiculous explanation.