A rather morbid topic and some disturbing replies. But for the most part I agree with what JC has said. Of course, in my twisted mind I have thought about it, conjured plans to do it, and thought about the supposed aftermath. Anyway it was just pure speculation, never in any seriousness whatsoever- there isn't anything going on in my life that's so tragic that it would compel me to off myself.
That aside though, I've always speculated about what happens after death. I consider myself an agnostic, so no belief in any afterlife. for the most part.
It's the nature of my circuitry.