It's one thing to walk into a 'Halloween' or 'Friday the 13th' movie and know what's coming your way. The guys in the masks carrying big blades are clearly the ones you should be running from. But what happens when someone doesn't have "killer written all over their forehead?" See, those are the ones that you have to watch out for, the ones with the ability to pose as nice, normal people, but then do a complete 180 once they've worked their way into your home and life.

The premise of the upcoming film 'The Roommate' is really quite clever. A college campus is an opportune location for a silent threat to take advantage of a new student's vulnerability. In honor of Rebecca (Leighton Meester) preying on her random roommate, Sara (Minka Kelly), in theaters this weekend, we're taking a look at some of the other deadly characters who used the sneak attack approach to get the one up on their victims.

They're lethal, murderous and at time psychopathic, but when you first meet these folks, they're as harmless and friendly as they come.
Psycho Movie Poster
Based on 17 critics

Phoenix secretary Marion Crane (Janet Leigh), on the lam after stealing $40,000 from her employer in... Read More

Saw Movie Poster
Based on 32 critics

Photographer Adam Stanheight (Leigh Whannell) and oncologist Lawrence Gordon (Cary Elwes) regain consciousness... Read More

The Stepfather Movie Poster
The Stepfather
In Theaters on 1987

Jerry Blake (Terry O'Quinn) is a family man, but he happens to have a series of families, with each one... Read More

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Hard Candy Movie Poster
Hard Candy
Based on 30 critics

Hayley (Ellen Page) is a precocious teenager who goes to a coffee shop to meet Jeff (Patrick Wilson),... Read More

Funny Games Movie Poster
Funny Games
In Theaters on March 14, 2008

When Ann, husband George and son Georgie arrive at their holiday home they are visited by a pair of polite... Read More

The Lovely Bones Movie Poster
The Lovely Bones
Based on 36 critics

After being brutally murdered, 14-year-old Susie Salmon (Saoirse Ronan) watches from heaven over her... Read More

The Roommate Movie Poster
The Roommate
Based on 16 critics

When Sara (Minka Kelly), a young design student from Iowa, arrives for college in Los Angeles, she is... Read More

categories Features, Cinematical