Not sure which one of the 2, but definitely either Alien or Aliens (they used to be on a movie channel every other week or less, (TMC?) so when channel surfing, i'd always end up watching once again.) - I must have easily seen both well over 100 times and if they were on again, and there wasn't anything better to watch, no doubt i'd watch them again (and again, and again.....)
I have seen most of the films mentioned by others like Aliens and Hot Fuzz a fair few times too. These were the days when I flat-shared with mates rather than Mrs TC and actually got to watch films from start to finish and watch the same film a couple of times a year. The era of the DVD too, where one tended to watch al the way through rather than the throwaway online film culture. I still have a trunk full of DVD's and a player. Gone are the days when they lined the walls, proudly out on display. *wipes a tear from my eye*
Die hard, watch it 2 or 3 times a year especially at xmas, Also the kiss goodnight, both great films, good humor mixed with plenty of action sequences and half decent stories.
Last year there was an outdoor screening of Jaws in my road, got home afterwards and it was on TV, watched the last half hour again (including adverts), then dug the DVD out and watched it again.