Spec Pizzas. Need I say more? The absurdity is so obvious that it is hard to understand why thoughts of spec work being positive prevail. I have never done that. And as much as these pizza guys will never visit that potential customer again I want to encourage you that you also walk away from people who show no respect for your professionality. No money, no cookies. (Or pizza, for that matter.)
By the way, we have more cartoons for you here.