That (if it worked), is a ninja. Take a good look, cos they rarely stay in one place for more than a few milliseconds, and even that is a long time for them.
You see, a ninja is no ordinary being like you or I. It is a secretive, mystic, and ancient power, passed down from ancient Asia, through the generations, until it reached today's world. You cannot 'become' a ninja unless you already are one. I may be rambling and making little sense, but that does not diminish the awesomeness that makes up a . They are most commonly found nowhere, as, if you ask them, they will deny their own existence. However, a few minutes spent on any well-reputed internet forum is sure to bring you into contact with a few of these creatures of stealth and might. Be warned: crossing a ninja would be the second-last thing you ever do, the last thing being dying.