Doofania is the city-state which Dr. Heinz Doofenshmirtz created with help from his assistant, Norm, so he didn't have to live in a place that his brother Roger and his ex-wife wouldn't disturb him. He built it so that it floats on the water on an innertube. Before he built the actual "country," Doofenshmirtz made a plush model because he had a lot of felt handy. It was destroyed when Phineas and Ferb fired their Rainbow-inator. A boat full of fishermen in the harbor saw the rainbow, and one of them was so distracted he cast his line onto the inner tube that Doofania was floating on, sinking it to the bottom of the harbor. Minutes later, Doofenshmirtz and Norm resurfaced, soaking wet. ("Hail Doofania!")