What are they? Past or present, doesn't matter. Dramas, documentaries, cop shows, anything (except soaps)! Is there something you watch over and over again no matter how many times you've seen it?
I'm currently watching 24 for the 3rd time (possibly 4th....I can't remember) and it's still amazing.
so in no particular order:
Prison Break
The Wire
LOST was the most amazing programme at the time (along with the online info that was needed to understand the bloody thing) but I took the huff with it once I saw the last ever episode and have never watched it again.
Criminal Minds
and topping the list, 24.