Even if there's no ultimate answer, I find the slow mo video captures all over youtube on the subject to be fascinating. After all, we humans are complex creatures: our groovy reptilian cortex separates us from common herd animals or even apes (they don't kill each other in cold blood over ant hill rights). Check this out from Crystalinks:
The brain stem is the oldest and smallest region in the evolving human brain. It evolved hundreds of millions of years ago and is more like the entire brain of present-day reptiles. For this reason, it is often called the 'reptilian brain'. Various clumps of cells in the brain stem determine the brain's general level of alertness and regulate the vegetative processes of the body such as breathing and heartbeat.The ones below seem to have a weird 'eye glitch' that occurs, as if the TV loses control of its fake cover signal and exposes the sliver-pupiled monster beneath (THEY LIVE was no joke!)
It's similar to the brain possessed by the hardy reptiles that preceded mammals, roughly 200 million years ago. It's 'preverbal', but controls life functions such as autonomic brain, breathing, heart rate and the fight or flight mechanism. Lacking language, its impulses are instinctual and ritualistic. It's concerned with fundamental needs such as survival, physical maintenance, hoarding, dominance, preening and mating. It is also found in lower life forms such as lizards, crocodiles and birds. It is at the base of your skull emerging from your spinal column.
Or what about the vids of celebs and glass-eaters with disappearing fangs?
Another reptilian shape change aspect is the 'matrix glitch' - something that often happens of Fox:
Here's the king of the reptilian conspiracy theorists, David Icke.
I find Icke fascinating and have read his book, The Lion Sleeps No More, which I heartily recommend, even though I think he's a little cracked, but he makes me wonder about the Satanic panic of the early 1980s, and the weird link of sleep apnea and sleep paralysis to alien abduction to pan-dimensional resonance.
I personally neither believe nor disbelieve any of it, instead I preach the evils of absolutes --in our universe there is no difference between the real and the vividly imagined, so why pretend otherwise? Perhaps mystics place too much importance on dreams just as scientists don't place enough! But I am also deeply suspicious of the way mainstream psychology avoids these subjects. If there was no proof to it, why not deal with the belief system in an objective manner, rather than petulantly scoffing?
Mainstream science detests vagueness and thinks subjectivity can be transcended through the scientific method. But they're wrong. The people we need to watch and listen to aren't the SETI operators, but the mystics and agents who do remote viewing of alien craft, or channel ancient disembodied alien collective voices. Sure these people could all just be making it up - like science fiction. But then again, where does science fiction come from? The mind knows a lot more than it's telling us. That's the place to look.
Science is scared to 'use the force.' It dismisses all of it as dreams, fantasies, and hallucinations. But we mystics know that sometimes visions are much more intense and vivid than 'waking life' - in a flash the entire universe can be known in an instinctive way that left-brain science will never grasp. Let us re-join our halves - let pharmaceutical corporations hire shamans from the Amazon to helm their research departments! Give David Icke a grant to test the blood of politicians for zygotes!