there are few things as irritating as knowing the end to a suspense drama. coming a really close second is knowing for certain that a twist is not what it seems. let me illustrate with the only example i know of. i belong to the average tv watching crowd. which means that i probably watch at least 3 unique versions of 2 different crime dramas(name these and pat yourself on your back- you've just toured the US from the east coast to the west), 2 completely opposite doctor dramas(one comic, the other acerbic), 1 insecure budding superhero saga and i can go on and on without ever reaching the end of my slot.
all of these except for the funny medico and the rookie man of steel are 1 hour dramas that have as their goal identifying either the murderer(a human) or the potential murderer( a disease). the trouble however is that to make things interesting, they introduce a villain about halfway through the show. the average human brain, being what it is, quickly calculates the time left (1 hour minus 40 minutes is roughly...wait let me open calc) and makes the logical leap to the fact that this cannot possibly be the villain. the villain has to be someone who is identified within the last 10 minutes of the magical hour. so one moment you are happily analyzing clues in ur mind and the next moment you realise that none of those are valid anymore.
a corollary to this is the crime drama that has an arrest in the middle but by then you see another apparently clean character played by an actor you know is more well known than the one who got arrested. case in point a law & order svu episode which has all fingers pointing to this indian doctor. when he gets arrested, you see Kal Penn in the background, as a janitor. any desi who is familiar with this actor of indian origin will instantly realise that he is the villain. he is too good an actor to play any role lasting less than 10 seconds.
my room-mate and i were discussing one possible solution to this issue a while back. just dont specify any time for these dramas. the show can end in the 21st minute or the 66th. of course we are yet to figure out the revenue stream from such a stupid idea. by the time we do that, you will all be downloading these random length tv shows into your iLens - the gazillion giga byte, Ultra Super Duper HD viewer, satellite communicator, 6 channel dolby surround sound stereo player, 5 giga pixel camera portable device that is actually a contact lens you can buy in green, pink, blue, white or black. your head will have a slight downward tilt when you wear it and you have to use iRenu to clean the iLens but gosh imagine your surprise when you discover who the murderer really is.