Yes, it would be a bit of the h-word (thanks for the warning, Otto), but I’ll try and keep it short. 
It was about halfway through a flight home to see my parents, a 5 1/2 - 6 hour flight. It was a night flight, and it was real quiet, the way flights at night get. Then, I hear this guy talking loudly, coming up the aisle. He marches past me, and he ‘blesses’ me with one of those little airline pillows, tapping it on my shoulder as he passes. He’s doing this to all the aisle-sitters as he goes up the plane. The article says he was saying, “We’re all going to heaven”, but I actually heard him repeating, “It’s going to be alright, it’s going to be alright” over and over again as he blessed us. This guy was BIG. Not tall big; probably not much taller than me. But he was clearly powrful, built like a football player (which, as I discovered from reading a newspaper article the next day, he was a college football player). The other passengers were just looking at each other, nervously.
Very shortly later, one of the flight attendants leads the man back past me, towards the back of the plane. She’s talking very soothingly to him, and he’s trying to insist he has something he needs to do (I couldn’t quite make out what he was saying here), but he does seem to be calming down. She takes him to the back of the plane, out of my sight (I was sitting about the middle of the plane). The guy next to me and I roll our eyes at each other, smile, and go back to reading our magazines.
Nothing happens for probably another fifteen or twenty minutes, when the guy comes BOUNDING back up the aisle, followed by a clearly disturbed flight attendant. “I need to speak to the pilots,”, he’s saying. “Sir! Sir!”, she’s practically yelling at him. There’s a very nervous murmur running through the other passengers now. This was way before 9/11, but it didn’t take that to happen to know you don’t want a very large, crazy man in the cockpit. This was the first point at which I was truly frightened.
After a few mintues, he’s led back again, this time by the same flight attendant and a male flight attendant. I lean out of my seat and watch as they reach the back of the plane. The guy sitting next to me says something to me, and I turn away from the back of the plane to face him, but before he finishes, there’s the HUGE commotion and some shouting at the back of the plane. I turn back to look. The first thing I notice is that the guy is heading back up towards the front of the plane. The second thing I notice is that the flight attendant, the one that seemed to be doing a good job of calming him down, is friggin’ GONE. This was clearly when she’d been flung across the seats, but I didn’t know that at the time. And this huge, insane guy is marching up the aisle towards the cockpit. I don’t mind admitting, I’m scared. I don’t know what to do. Get up and try and stop him? He’ll run right over me. I unbuckle my seatbelt, still not convinced I’m actually going to work up the nerve to actually do anything.
But, before he reaches my row, still about three rows behind me, he’s grabbed by the male flight attendant. A few other passengers jump on him as well, and there’s a scuffle. He’s brought to the ground and held there, but it’s certainly not very easy. This guy is struggling and putting up one hell of fight, and it’s taking all of the guys on him to keep him down. Once again, I consider getting up to try and help. Then I see them tying him up with spare lengths of seatbelt. He’s still struggling, but not as much now. They lead him to the back of the plane. After a half hour or so, my heartbeat returns to normal.
As the plane is landing a few hours later, they tell us to remain seated and strapped in at the gate until told otherwise. We land, reach the gate, and several cops come on board and go to the back of the plane. After a few minutes, the guy is led out of the plane, handcuffed.