When someone has a 'secret' and they draw it out through three quarters of the book by cutting off the chapter when someone is about to find to out The Secret.
Books that have one of those scenes from the murderers point of view at the beginning. 'they pulled on the leather gloves and ran a finger across the blade. They would enjoy this tonight'
Where someone finds a clue as to who the murderer is and instead of phoning the police/intended murder victim, they put the clue aside and go shopping/do the washing up/go to bed and end up getting murdered themselves before they can let anyone know.
Where a female character examines herself naked in the mirror and describes herself for the benefit of the reader and is obviously gorgeous but has a tiny flaw that isn't really a flaw i.e 'she stood in front of the mirror and let the towel drop, running her hands over high pert breasts. She didn't consider herself beautiful. She had a heart shaped face, brown curly hair down to her full, round bottom, clear green eyes and a sprinkling of freckles across her small nose, but it was ruined by her full generous lips which always made it look like she was pouting. She was so ugly, she couldn't get a boyfriend'