12 Angry man (1957)
A streetcar named Desire (1951)
Black Swan (2010)
Rosemary's Baby (1968)
Casablanca (1942)
Gone with the Wind (1939)
While these six might not be for everyone, they do teach a lot.
(SPOILER ALERT)
Don't judge people so easily
Don't argue with your husband near the dinner table
Don't get high on your dream
Not everything must be perfect
Don't eat everything your neighbours give you to eat, only because they say "It's for the baby"
Love your child, even when he is the anti-christ
Love has an end date, memories don't
Always have a catchphrase prepared, when you are going to break up with someone, or leave them.