“Thriller” (** out of four) was a pretty routine urban slasher drama about a childhood prank gone wrong which comes back to haunt the group of South Central teens (Noah Abbott, Jessica Alain, Big Boy, and others) involved when their victim returns home for bloodthirsty revenge over Homecoming weekend. Mistitled slasher story is tepid at best and lifts quite a bit from “I Know What You Did Last Summer” among others but remains watchable. Mykelti Williamson (as a sympathetic cop) and RZA (as the school principal) add some style in supporting roles.