Ok to answer a few questions:

1) chain is a KMC... I've had problems with them in the past but we were out of everything else
2)chain did NOT break
3) i know how to tension a chain
4) chain tension was perfect (just a hair on the tight side at the tightest spot) when we left
5) we rode around for an hour on some trails, singletrack, did some skidding/skipping to make sure all was well
6) we stopped back at the house to grab some stuff, and i doublechecked the chain, tension was still good
7) several hundred yards away from the house, the chain let go
8) upon reinstalling the chain it was a fair bit loose
9) we retensioned it and all was well ever after, the end

*the cog is a 16t dura ace 1/8th, the chain was lubed with T9 (what else is there?) chainring is a sugino 42t

As far as the semantics of stretch vs. enlongate, I use the word stretch fully realizing that most likely, a metal chain does not actually stretch, but just like I say I taco'd a wheel knowing that in fact, it did not become an actual mexican treat. Its an expression. Also, my friend's room mate was nice enough to take me out tonight and show me a few good ways to stop should this ever happen again in the future. Thanks Kevin. As far as being irresponsible going 25+ on a hill, I usually hit 40 on this hill on my roadbike with little effort so I wasn't exactly riding out of my comfort zone or anything. I'm not exactly a newb here with no handling skills.

Anyways, none of this is a big deal really, and a lot of you guys are getting far too worked up over absolutely nothing of any importance. I think everyone needs to settle down a little. More than anything, the incident was amusing to me and what I thought was an interesting story.