Candles.
Rooms being entirely lit with hundreds of candles.
Short ones too- they would only last for so long- by the time you lit the last one the first ones are running out of wax.
It is especially annoying with a series like 'Jericho' - the world has been destroyed, all the town has was what is already in it- no delivery trucks of fuel or supplies ever expected again. People use what little gas they have left to go someplace just to discuss their feelings with each other, in a room filled with lit candles. It was empty when they came in, so somebody lit all the candles and then left them burning just to provide these two people with a nice backdrop for their talk.
Even in 'The Game of Thrones', they go down into an underground crypt which is lit with candles, short ones, and no one else around.
I know all these candles make for a wonderfully lighted scene full of atmosphere and warmth, but it is annoying the stew out of me trying to watch a scene and not wonder who is lighting all these candles and how little time they last.