You tried to fight, you tried to run, you tried to hide. You tried everything, but it wasn't enough. You're curled up in a corner, surrounded by zombies, you may or may not still have a weapon, it doesn't really matter at that point. The blood loss makes you worthless, you can barely see and forget about standing. At least it's making you numb enough not to feel too much pain. You're not in shock yet, so you can still think, and with great frustration, you realise that the gaping bite wound on your arm was no twisted whim of Fortune; while chance certainly did not favour you today, this would not have happened if not for your own weakness. Everything is getting darker now, while the zombies are getting closer. Death. Your last thought is for cursing yourself, because deep down inside you knew it would end like this.
In this scenario, you die, no other option. What, of your weaknesses, is the most likely to have gotten you into such a situation? Bad luck alone could do the trick, but lets say you did fail at some point. Which point will it be?
(If you think you have no such weakness at all, don't bother posting.
Dodom's deadly weakness:
My not quite average sense of observation would probably kill me first. I'd be all succesfully fighting off/escaping zombies, and then get bit by one I didn't notice. It's not so bad that I wouldn't have a chance to survive, but it's the most likely way it would go if I did die.
Then there's the non-existent social skills, but dealing with fellow survivors only becomes an issue after a while, plenty of time to be eaten before.