I have two favorite movies, and they're a bit disparate.
1) Jaws (1975)
I can't say anything about this film that hasn't been said by thousands of people for over thirty years, but I will say that I love that this movie is so much more than a big shark. There's so much human emotion - love and hate and humor - at the heart of it. My two favorite scenes are the one with Brody and his son at the dinner table and of course Quint's famous Indianapolis speech.
2) Ferris Bueller's Day Off (1986)
So funny. So well-written. So quintessentially '80s. SO GOOD.