I mean, I’ve personally seen a UFO more than once. I have no idea what they were - especially the one during a thunderstorm - but I’m pretty sure they were human, just based on who normally builds things like that.

I never had a little green man visit me, and to my knowledge most the cases of that read a lot like someone’s sleep disturbance or episode. The remainder are few enough I do go to lying. If one landed in a crowd in Arizona, I’d give it to you, aliens are here, but they just haven’t.