I could hear the chaotic laughter trailing behind me. It turned the ageless trees into a menace. They loomed around me, while hiding him. The branches tore at my skin in an effort to bind me, while weeds sought to shackle my ankles, so that I could go no further. The pain they caused was minor, when I compared it to the searing inferno at my core.

There is a species of primate in South America more gregarious than most other mammals, with a curious behavior.The members of this species often gather in groups, large and small, and in the course of their mutual chattering , under a wide variety of circumstances, they are induced to engage in bouts of involuntary, convulsive respiration, a sort of loud, helpless, mutually reinforcing group panting that sometimes is so severe as to incapacitate them. Far from being aversive,however, these attacks seem to be sought out by most members of the species, some of whom even appear to be addicted to them....the species in Homo sapiens (which does indeed inhabit South America, among other places), and the behavior is laughter.

It felt terrific. It felt deeper and richer than laughter. It felt like opening a door and tumbling headfirst into a pile of feathers.

There is one kind of laugh that I always did recommend; it looks out of the eye first with a merry twinkle, then it creeps down on its hands and knees and plays around the mouth like a pretty moth around the blaze of a candle, then it steals over into the dimples of the cheeks and rides around in those whirlpools for a while, then it lights up the whole face like the mellow bloom on a damask rose, then it swims up on the air, with a peal as clear and as happy as a dinner-bell, then it goes back again on gold tiptoes like an angel out for an airing, and it lies down on its little bed of violets in the heart where it came from.

No one just starts giggling and wearing black and signs up to become a villainous monster. How the hell do you think it happens? It happens to people. Just people. They make questionable choices, for what might be very good reasons. They make choice after choice, and none of them is slaughtering roomfuls of saints, or murdering hundreds of baby seals, or rubber-room irrational. But it adds up. And then one day they look around and realized that they're so far over the line that they can't remember where it was.

That__ the problem with you nearly immortal types,_ I said. __ou couldn__ spot a pop culture reference if it skittered up and implanted an embryo down your esophagus.