While eating lunch at a Staten Island pizza joint Friday, the mayor used a knife and fork to eat his slice.
That's a no-no for most New Yorkers, who are very opinionated when it comes to pizza. Most advocate using their hands to hold the slice, folding it over and then taking a bite.
Photos of de Blasio using the knife and fork were posted to Twitter and prompted mock outrage on several blogs and social media websites.
De Blasio later explained that he eats pizza the way they do in Italy. He starts with a knife and fork, then uses his hands.
He also noted that his slice had a lot of toppings.