Just to throw my two cents in and get the hell out of here, y'all can make fun of UFO enthusiast if y'all want, but the only thing standing in the way of UFOs coming from another planet is the distance they would have to travel, and that's it.
Of course, if there is life on other planets, they might not have advanced as far up the evolution ladder as we have, but then again... they might be a couple hundred years ahead of us in space travel. Just think where we'll be in two hundred years.
TBH, there just might be an X-Files kind of explanation behind everything, but what I really find interesting are the Men in Black stories.
True or not, they certainly are the definition of weird, but as always, this is all just my opinion.
And as always, your mileage may vary of course