My quickest death is still amusingly remembered at our game table.
I was playing a half-orc ranger that was dual-wielding broadswords in a 2nd edition game where we were using critical/fumble rules. We came across a group with an ogre and roll initiative. I roll the highest and act first, charging the toughest looking member of the group, the ogre. First attack roll, natural 1, fumble check, consult table, hit self. Second attack roll, because I am dual-wielding, natural 1, fumble check, consult table, hit self with critical, critical check, triple damage. It was the first action of the groups first encounter of the campaign and I managed to eviscerate myself without ever doing a point of damage to my enemies.
Needless to say, the group sat around the table in silent shock and, in my case, disappointment until we broke out in laughter when it was obvious what had happened. The DM ruled that the ogres, awed by the display of ferocity on the party's part, turned tail and ran away. He had to think of something since the encounter was going to be a tough one and a TPK was likely with the group already down a member.
Shane