Films with a dreamlike atmosphere.
One of my favorite qualities of a film is for it to be dreamlike. After all, Scorsese says movies are like dreams. A film with a dreamlike atmosphere and tone can be an experience like no other. They take you away into the world the film inhabits.
A film that is dreamlike is made up of a variety of components:
Odd behavior from characters
Specific use of music and sound
A specific tone
A strange narrative (might be subject to an unreliable narrator or not)
Unnatural designs (sets, costumes, etc.)
And other various factors.
Contribution and participation is always welcome. :)