Who is having fun writing screenplays?

I am rewriting parts of Where Wildflowers Grow. The best time in screenwriting is when you have that moment of recognition that you are no longer writing it, but the character has taken over and is writing it. Knowing who is your character helps to make this moment occur in your writing. Visual your character physically, know it's habits, likes and dislikes, and know its philosphy of life. Then, dialogue becomes easy and the character will hopefully take over the writing.