In 'Obsessed', Derek Charles (Idris Elba) sparks a relationship with his smoking hot new co-worker Lisa Sheridan (Ali Larter). One little problem… Derek already put a ring on Sharon Charles (Beyonce). Crazy Lisa doesn't want to hear that though and continues her pursuit anyways. The unrelenting stalker character is a Hollywood staple, so will 'Obsessed' result in some good scares or unintentional laughs? Here's a look back at some of the best and worst stalker movies ever.

'Play Misty for Me' (1971) - Long before Jessica Walter made a career of playing boozing, acid tongued grandmas on the likes of '90210' and 'Arrested Development,' she starred as Evelyn Draper in this gem of a 70s thriller. Evelyn, a huge fan of radio jockey Dave Garver (Clint Eastwood) constantly calls into his show to request the song "Misty." Dave meets up with her at a bar and eventually goes all sorts of crazy on him. Showing up at his workplace? Check. Threatening the girlfriend? Check. Beating up his maid? Uh…check. If only iTunes and YouTube had existed back then, Evelyn could've just listened to the song whenever she pleased, and left Dave alone.