thaluikhain said:
Eragon ripped off Star Wars. Not in a "the Doom movie was Resident Evil in space" way, but in a truly shameless, scene for scene way.
It starts with a princess being pursued by an evil empire's forces. Before being cpatured, she sends away something of extreme value. It's found by a farmboy who lives with his uncle. He's not sure if he should get involved. After the empire come looking for it and kill his uncle, he decides to go off with this wise old mentor, who used to fight the empire but put that on hold after they lost the war. They meet an untrustworthy scoundrel they are forced to deal with. They find out the princess is being held captive at the empire fortress and go resuce her, but the mentor is killed...and so on
It's called the "Hero's Journey", which is a basic template to film making. Star Wars followed it to the letter, so did Eragon. Difference being Star Wars was a good movie.
I'm going to say The Grudge 2. I've not seen the first, but the second was possibly the worst movie I've ever seen...and it's a sequel to an adaptation so enjoy.
EDIT: Quoting went horribly, horribly wrong. Is fixed now.