I get into the seeing het argument a lot. (I'll probably get a PM about it because I mentioned it). If you have a book on reptile genetics sitting on your desk and you have read it, I'll have the argument with you. If I hear "pied markers" as a reference to a visual het one more time, I'm going to flip.

(btw, I wouldn't use the term 'idiot' in reference to the people I have this argument with. In fact, I will freely admit that they probably know more than I do when it comes to reptiles.)
Why?... You dont think a phenotypic response can arrise when a certain genotype is present?

Scientists use this occurence in research on a regular basis. They splice a "glowing" gene that causes the organisms, usually bacterium, to glow when a certain gene is turned on. Its a phenotypic repsonse according to a genotypic response.