Let's back this up a moment: why am I talking about talking to myself (or am I talking to myself)? I want to illustrate the idea that creativity is not rational. Never has been, really.
"Have I gone mad?"
"I'm afraid you have. Entirely bonkers. But I'll tell you a secret: all the best people are."
I'm not saying to follow some New Age philosophy of doing Odd for the sake of Odd. I'm saying the moment you think to yourself "this is crazy. It will never work," is exactly the moment you should take out your pen and paper and start writing; your brush and start painting; your camera and start photographing. Good things happen artistically when you are outside your comfort zone, when you've thrown the rationality, the safety net and the good-and-sensible rules into the backseat. Keep them there for later - you might need them; but during the early stages of the creative process you've got to throw caution to the wind.
The worst thing that can happen is you won't use the product of your craziness, in which case you can consider it educated research. XD
What's the best thing that happened to you when you did something crazy?