Sixty-six percent of participants reported massive deformations of their own face. Eighteen percent saw one of their parents with a few traits altered; 10 percent of those parents were already dead. Twenty-eight percent saw a stranger's face, like a child or an old woman. Most revealing of all, perhaps, was that almost half of the participants saw "fantastical and monstrous beings."
Why? Well, for one thing, if you stare at anything long enough -- and we mean just stare at it, not look at it while doing something else, like shaving -- your vision starts to distort it. One reason is the Troxler effect. Stare at the target below for 20 seconds or so:
Combine with liquor for free vertigo!
Did the dots start to disappear after a while? If not, you did it wrong. The idea is that our brains are wired to stop taking in the same thing over and over again, just for our own sanity. Imagine always being aware of your limbs, of sitting in a chair, of every breath and every blink. Life would suck. So, as a neat trick, our neurons cancel out information that's constant.
Like that damn baby your girlfriend dumped on you.