Best films.. I hope you mean to each person. Because I have a book of the 100 greatest films of all time, and...Eh, I guess it depends on your age, (Generation) and personality, For instance I love goonies, but not because its a masterpiece but I think because I was the exact same age as those kids when the movie came out.
So some movies I think are worth mention are, and in no special order.
1.
(Saviour) I bet most of you missed this one, but very much worth a watch.
2.
(An American Werewolf in London) I was about 6 years old in the playground of a drive in, and seen the scene where he turns into a wolf on the big screen, It was the most amazing thing I had ever seen!
3.
(The Hitcher) 1986 with Rutger Hauer, there have been many copies but none live up to the original.
4.
(A Christmas Story)
5.
(VACATION) Dead grandma in chair strapped to top of car, Classic.
6.
(The Birds)
7.
(Aliens) Aliens, space marines, face suckers and an andriod, whats not to love.
8.
(Platoon)
9.
(Altered) also a little known movie, if you like sci fi and aliens even just a little, this is a must see. Best spooky thriller I have seen in a long time.
I could go on for ever, Ill just stop there.