The problem isn't coming up with ideas, its is how to contain the invasion...

The problem isn’t coming up with ideas, it is how to contain the invasion. My ideas are like uninvited guests. They don’t knock on the door; they climb in through the windows like burglars who show up in the middle of the night and make a racket in the kitchen as they raid the fridge. I don’t sit and ponder which one I should deal with first. The one to be wrestled to the floor before all others is the one coming at me with the most vehemence. I have, over the years, developed methods to deal with the invaders as quickly and efficiently as possible, though the burglars never stop coming. You invite a handful of friends for dinner, but the door bursts open and a hundred people are pushing in. You might manage to get rid of them, but from around the corner another fifty appear almost immediately… Finishing a film is like having a great weight lifted from my shoulders. It’s relief, not necessarily happiness. But you relish dealing with these “burglars.” I am glad to be rid of them after making a film or writing a book. The ideas are uninvited guests, but that doesn’t mean they aren’t welcome.
— Werner Herzog