When I lived up in CT, there was a restaurant called Willington Pizza. They had some pretty strange types of pizza. They were famous for their red potato pizza but I liked the cheeseburger pizza. They used ketchup, mustard, hamburger, cheese and pickle. I was VERY hesitant about trying it but it wasn't too bad.
My favorite is any New York style pizza though. My DH and I were heading to Atlantic City for one of our vacation trips and we stopped in NYC just for a slice. Mmmmm...I am too far away from there now though!