Here is some Harry Potter BadFic.

Another chance with a human time turner, By Missuglychick:

What happens if a witch happens to have extra abilities sends Ginny, Hermione and herself back in time. Can they change Voldemort from killing Harry's parents? Only time will tell. GW/SB RL/OC JP/LE HG/SS

http://www.fanfiction.net/s/5606343/1/Anotherchancewithahumantimeturner

Comments: the first is a time-travel Fic, which as a science teacher and as a person of general logic I have a deep loathing for. Whether it is the COMPLETE lack of grammar, the idiotic names, Ron bashing, or simply pairing people for the sake of pairing, this is one that must die painfully.

Hairy Snotter and the Voldymort's Bone, By Alicecooperultimaterockpenguin:

J.K Roaring or whatever she is called didnt write the story properly. I am going to tell you the brutal and horrifying true story of what happened to Hairy Snotter.

http://www.fanfiction.net/s/5606528/1/HairySnotterandtheVoldymortsBone

Comments: The second one is attempted rewrite of the Harry Potter books and in the summary claims J.K. Rowling had it all wrong and THEY (Alicecooperulitmaterockpenguin) (no, really) have the real story. I might have let it pass if it had a parody tag but alas its tags are Tragedy/Horror. Granted it has only one chapter but it's pretty scary and not in a good way.

Harry Potter: Life in America, By GredForgeweasel:

It's Harry's first year at Hogwarts. He not only learns about magic, but he also finds out that he has a sister who is seven years older than him at Salem Academy of Magic and Arts.

<a href="http://www.fanfiction.net/s/5605516/1/HarryPotterLifeinAmerica">http://www.fanfiction.net/s/5605516/1/HarryPotterLifein_America

Comments: Eh where to begin... well disregarding the fact that if Harry DID have a sister that was seven years older then him that Lily would have been pregnant at 13; That there would be not such thing as a wizards internet in 1991 as the Internet was released for muggles commercially in 1991 and that even then it wasn't very popular; That Katy Perry’s song 'Waking up in Vegas' as released in 2009 NOT 1991; That the tri-wizard tournament was in Harry's fourth NOT first year; That there is no Salem Academy of Magic And Arts (mentioned canonically), And that Jailynna Lillian Snape is a blatant Mary-sue, there is absolutely nothing wrong what so ever. No siree bob.