When I was testing for my greenbelt, the instructor was calling out the names of moves I had to perform on a buddy who was acting as the "meat puppet." After a few throws and strikes, the instructor said "perform a forward Hadouken." I paused for a second, lost in my ignorance. Then it came to me. I performed it flawlessly, yet the fireball never came out. Luckily the instructor overlooked my lack of control of mystic fire.
A properly performed Hadouken: