Murder on the Orient Express/Fridge

Fridge Brilliance

 * In the 1974 Murder on the Orient Express, every time Poirot finishes questioning a suspect, Bianchi (I think) says "It was (her/him)! (He/she) did it!"
 * In the book, when they learn the victim was repeatedly stabbed, Monsieur Bouc immediately labels it a crime of passion and says that the murderer must be a woman. Actually,  Well played, Agatha.