The day opened on the Flynn-Fletcher home. Phineas and Ferb were watching a nature documentary. Documentary Reporter: Birds build their nests from a variety of materials, including feathers, sticks, and paper. Phineas: Wow! Imagine sleeping in a bed made of sticks! You know, Ferb, we humans are lucky to be able to make things. We can build houses and beds and anything we want. Too bad the birds can't build themselves awesome houses. Ferb nodded. Phineas: Hey! That's it! Ferb, I know what we're gonna do today!