Well,

My personal #1 is Pirates of the carribean 3

Because it's funny, sad, and intense.
One of the main reasons though, is because of Hans Zimmer - the guy who made the soundtrack for the film.
The soundtracks in that film are some of his finest works. Since potc3, I became a huge huge huge fan of Hans Zimmer.

Here's a list of the rest of my favourite movies:

Lord of the rings trilogy
The dark knight
saving private ryan
Les Misérables
Pulp Fiction
Inglourious basterds
Interstellar <-----------Best movie of 2014
The Prestige

Probably a few others more but I don't remember.