Often, reports of UFOs become so bizarre and convoluted in the way they are explained that they fall just short of being comprehensive (and perhaps more often, they seem to miss any and all logic by more than a nautical mile).
Thus, the stranger aspects of the UFO experience, particularly the manner in which alleged UFO craft are able to move and maneuver, are so strange to humans that the reports are dismissed outright as hallucinations, gross misinterpretations, or outright lies.
Still, human perception of the phenomenon at hand--whatever that may be in a given case--is also a factor which must be given credence. After all, as Carl Sagan brilliantly pointed out in the 1970s, the manner in which we might assume a one-dimensional creature would perceive a two-dimensional invader could be strange indeed. Could humans perceive aliens from other realms, especially if they had the dimensional capabilities to "shift" into the fourth dimension, in the same way?
To illustrate how this might work, we'll set the stage by imagining a small, furry and yellow one-dimensional buddy who crawls up and down a straight line. This, in his one dimensional world, is about all he can do (and for those of us in a 3D realm, it sounds none-too-exciting). Now imagine a big red fuzzy from 2D land, who suddenly makes a pit stop on yellow fuzzy's 1D line... and to make it more interesting, let's say our 2D friend is shaped slightly like a horse shoe, so that when he lands, each of his "legs" strikes a different location on yellow fuzzy's 1D line. As yellow travels along, he'll be shocked to see that similar representations of this "invader" appear to exist simultaneously in two different places on his 1D line. Below is a video that demonstrates a similar concept:
Sagan had such a unique way of presenting these sorts of concepts, and needless to say, the implications for how humans might similarly perceive strange phenomenon from other dimensions is illustrated far more clearly. Hence, the odd maneuverability of UFO craft, or even the strange, sudden appearance of a ghost, bizarre monstrosity, or other apparition might not seem so far out after all! Now if humans can just manage to grasp the concepts altogether: after all, Lord Rees of the British Astronomical Society recently told the British Daily Mail the following regarding whether humans will ever be able to grasp such mysteries present within the cosmos:
Just as a fish may be barely aware of the medium in which it lives and swims, so the microstructure of empty space could be far too complex for unaided human brains.
Indeed, as much as we know, there may be a few things we just won't grasp... hence, will we ever truly unravel the mysterious nature of the cosmos, or at very least, the strange objects and other oddities sometimes witnessed right here on Earth?