I've seen various fics based on this particular challenge quite a few times, mostly on Fanfiction.Net. Some of them have included the entirety of the actual challenge, while others didn't, or they only posted some of it. So here's the complete thing, as far as I've been able to tell.
It's for my own reference in case I get the inspiration to answer the challenge, otherwise carry on. Unless, of course, you feel like writing it yourself. :)
CHALLENGE:
Challenge issued by "Reptilia28" - Originally on Portkey(dot)org verbatim:
A funny little challenge I just came up with. It's a comical twist on the time-travel category.
STORYLINE:
*Harry is killed at 17 during a fight with Voldemort. He's sent to his Death's office (explained later) and finds out that this isn't the first time that this has happened.
*Harry's Death (who can have a human name) is mad at his arrival. Apparently, people dying before their time is a black mark on the various Deaths' records, and Harry is getting perilously close to getting this particular one fired.
*When Harry asks what was supposed to have happened, Death goes off on a rant saying how he was supposed to have killed Voldemort, found his soulmate ("Some Granger girl...") and lived to be a centennial age. But since Harry keeps getting into life-threatening situations for one reason or another, he keeps dying before that happens. Harry is surprised about the soulmate part.
*Death gives Harry a paper to sign that allows him to retain his memories (the previous times, he wasn't given this option for some reason). Harry is deposited to a previous time of the writer's choosing.
*Eventually, Harry gets it right. He kills Voldemort, gets the girl, and lives to a ripe old age of whatever. And Death doesn't get fired.
REQUIREMENTS:
*Harry had to have died at least three times before this one.
*The memory keeping contract must be included.
*Death must refer to Hermione as "some Granger girl" when Harry's soulmate turns up in his rant.
*Obviously, must be H/Hr.
*Have fun.
OPTIONAL:
*Dumbledore's manipulations can be a factor in Harry's premature demises.
*Hermione may or may not be told of Harry's little "situation."