things that do not match the definition of UFO:
- alien spaceship, identified
- alien spaceship, landed
things that match the definition of UFO:
- angel, flying
- likely a bird but possibly an airplane
- unexpected rock from catapult
@anarchiv also literally a plane we know about and is identifiable and even but all the pilots in the air can't see it to identify it clearly because they're all looking the wrong way and it's in a cloud.
