Harry shook his head. "No. Part of my alchemical transformation was to be aware of tricks and illusions. It was like the third gate of my journey. I actually think it happened when I found Sirius. I got over the tricks and illusions of his and Pettigrew's true nature. After that, magical creatures couldn't trick me anymore. That just got stronger when I really got into alchemy. My mind would know what the Boggart really was, and wouldn't react to it when it changed shape to be a Dementor. Not that anyone actually knows what a Boggart really is."