Have you ever seen a UFO?

Several.

Once it turned out to be a flock of geese with the sun reflecting off their feathers.

Once it was a helicopter flying at night, I saw the searchlight and didn't know what it was at first.

And once my brother tossed a frisbee covered in tinfoil past my window.

Yes, But when I look at it through a telescope it was a high altitude scientific Balloon.

All UFO/s or at least 90 percent of them are man made right here on Earth. The others are acts of Nature.

I have not identified any of the half dozen airliners passing to the south every day, so they are UFOs. I suspect that some of them were made in Brazil though.

I saw something that appeared to be a UFO, but it turned out to be the Goodyear blimp.

No I haven't

Yeah, there was a huge one blocking the sun today.

Plenty, but are they spacecraft, I dunno?

I've seen a couple of things I couldn't identify, yes.