You can write about how people view or fall into the depths of (the undead, I can't put the s word) for instance, a feeling of pressure to someone who expected to privial yet they are still not match for those dark and twisted emotions that often are coated with temptation. An example of line they can say in their last moments would be, "I always loved necklaces, made me confident and want to go out more. Today I'm wearing a new necklace, it's made of rope but this time I felt free."
An other idea would be how easily yet unnoticeable one can change for the worst. Being to distracted to hear anyone's pleads. And when they are finally alone they come to the realization that they in fact have lost themselves.
“don’t talk to strangers” they said, as I look at myself in the mirror with tears in my eyes. I realize I am the stranger, who am I? why me?