It was on there fairly recently.
A top 5 would be difficult for me but I think maybe
1. Jaws. I can't even explain why I love it si much. I just do.
2. Full Metal Jacket (I only watched this properly fairly recently and I loved it)
3. Jurassic Park (nostalgia playing a big part here)
4. Hunt for the Wilderpeople
5. Pan's Labyrinth
You could probably stick something like Terminator 2 in there somewhere because I will happily watch it over and over and not get sick of it. My tastes aren't particularly highbrow.