In like 2003 my sister and I were driving home through a big stretch of country and we saw a fucking huge ass disc with lights around the edge jet up from the tree line and disappear into the clouds at an extreme speed. I don't think it was aliens but damn I sure will always wonder wtf that thing was.
I guess - more than a year ago I was getting ready for bed at around 3 or 4 am. As soon as I got under the covers I started hearing some kind of booming noise outside that kept going for over 10 minutes. Thinking “holy shit is there a fucking 20 car pileup outside??” I got up to try and get a good look outside. The road nearby was clear, but then I saw this perfectly stationary, huge, blue-white light in the sky that was brighter than everything else. I should add it’s pretty hard to see stars and even the ISS through all the light pollution here. A little weird.
Now, I only checked it out for a few moments. I was too tired to stick with it for very long, but in the literal sense of the term, it was a UFO from my perspective. 99% chance it was a helicopter or something though.