It's fun when you're playing the whodunnit game along with the characters. You know how to sort out the red herrings and all-too-obvious suspects, and guessed who the unsub is before our BAU guys do. If you win, you get to down two shots! /not a drunk

Sometimes the creepiest storylines are when you've already seen the unsub but it didn't matter. Like in 'Lucky' and 'Mosley Lane'. It's more of a 'how you trap/catch it' game.