I will not eat green eggs and ... purple potatoes?!

I had heard of purple potatoes, but I thought, surely, they can't be very, very purple.  Holy crap, they ARE.  They don't taste any different from regular potatoes, but they look like they should.  My brain did NOT want me to eat that potato, but I knew it was okay.  My brain was confused, because my mouth said it was just a potato.

I wonder if that kind of cognitive dissonance is experienced by kids that eat green ketchup or other weirdly colored foods.