"I always like to think of a scene like this: As the lights come up two people walk into a room from opposite doors, meet in the middle, and begin to struggle past each other to reach the door on the other side.They each enter the scene with a goal and standing in their way is an obstacle. That's conflict. And whether it's physical or verbal or simply a guy who needs to pee and must get to the bathroom soon or else!, that conflict must be foremost on your mind when you conceive each scene."
-Blake Snyder, pg. 111 of Save The Cat