The unsub would kill their victim based on their favorite horror movie. You were a BAU agent and got a call from an unknown number

Spencer Reid: who is it?

Aaron Hotchner: who is it, do you know?

Jennifer "JJ" Jareau: who?

Penelope Garcia: do you want me to trace it?

Derek Morgan: who is it genius?

David Rossi: who's that?

Emily prentiss: who's that?