The Murder of Roger Ackroyd/YMMV


 * They Changed It, Now It Sucks: The television adaptation starring David Suchet as Poirot has been criticised as a disappointment in this regard. Although in their defence, the novel does hinge on a literary device difficult to replicate on the screen.
 * Moral Event Horizon:  started out a good-ish character who tragically slid down the slippery slope to , but probably crossed the line by driving Mrs Ferrars to suicide.