Then, something happens. In the middle of the night all nine suddenly leap out of their tents as fast as possible, ripping them open from the inside (not even enough time to untie the doors) and race out into the sub-zero temps, without coats or boots or skis, most in their underwear, some even barefoot or with a single sock or boot. It is 30 degrees below zero, Celsius. A few make it as far as a kilometer and a half down the slope. All nine, as you might expect, quickly die.
And so it begins.
Why did they rush out, unable to even grab a coat or blanket? What came at them? The three-month investigation revealed that five of the trekkers died from simple hypothermia, with no apparent trauma at all, no signs of attack, struggle, no outward injuries of any kind. However, two of the other four apparently suffered massive internal traumas to the chest, like you would if you were hit by a car. One's skull was crushed. All four of these were found far from the other five. But still, no signs of external injuries.
Not good enough? How about this: One of the women was missing her tongue.
That's right- her tongue was missing. You didn't see that coming, now did you? The official findings of the government inquiry? "Unknown compelling force." I feel better, don't you? Go, read- here's the Wikipedia page too, in case you are as strange, er, I mean, fascinated as me.