This is my nomination. I read it a few years back but it still sticks in my mind as one of the funniest stories I've ever read.
The short synopsis of the story is that some guys go 4 wheeling in Alaska and on the way back, they get into trouble, and it just goes from bad to worse... Funny as hell. Post #1 and #12 are the main parts of the story.
http://alaska4x4network.com/showthre...9322#post19322
Some of what happened was even caught on video
http://www.youtube.com/watch?v=bpibZVpZhK4