I'm one of those nuts who can recite dialog from movies as though it were my own... at the right moment. When you think about it, the screenwriters are paid a great deal of money to craft each line perfectly. When I find the same circumstances, I think its clever to use something clever from a movie (and make it seem like it was my own)

Some of my favorite movies are

Meet Joe Black - great remake of the 1939 "Death takes a Holiday" - gives perspective on family and time

Go - amazing film about reckless youth with the story carrying 4 threads that move to a single Christmas Eve.

The Fabulous Baker Boys - I like to think I'm like Jack but am probably more like Frank Baker
American Beauty - the first screenplay he writes becomes Oscar winning for script and best pic
The Long Good Friday - British gangsters, Bob Hoskins and Helen Mirren at their best
Breaker Morant - Edward Woodward & Bryan Brown in a dramatic legal defense
Scarface (Oliver Stone is the screenwriter)
Godfather Part II - better than "the Godfather"
Masada (this is a very overlooked work of Peter O'Toole & Peter Strauss)
Becket (O'Toole & Burton's voice & dialog can only be rivaled by Patrick Stewart)
Bounty
Wall Street
To Live and Die in L.A.
Field of Dreams
2010
Heartbreakers (Nick Mancuso and Peter Coyote in a great study of 2 men, how their lives changed and mid-life)
Chariots of Fire
Aliens (much better than Alien, we agree Alien 3 should never have been made)
A Very British Coup

TV shows and *their* dialog

You can tell a TV show is well written, when they don't step back to fill you in and they don't use a person's first name repeatedly in ways that you wouldn't in real life.

An example of BAD TV writing is Jada Pinkett's "Hawthorne". Notice how they repeat the same situation or a person's first name. I know it was pitched as "Grey's Anatomy meets ER" but it lacks the realism of the Crichton show.