I love the old screwball comedies like "Bringing Up Baby." The characters in those typically were fast-talking, witty, and playful.
Even if your script or novel isn't populated with those kinds of characters, often it's easy and fun to slip in at least one.
If you'd like to be inspired in terms of their dialogue, a great resource is the 1913 edition of Webster's Dictionary, which is easy to access online here:
A conventional character might call someone a crook.
One who expresses himself or herself in the screwball tradition, however, might say, "You, Sir, are knavish, fraudulent, and unjust. You have made a U-turn on the path of rectitude."
Even if there's no room for such a character in your project, spending 30 minutes randomly browsing 1913 definitions will give you more joy than an equivalent period on Facebook!
