Phineas and Ferb: Season 2, Episode 8
Don't Even Blink/Chez Platypus (4 Apr. 2009)
In "Don't Even Blink", Candace, her brothers and the rest of the neighborhood build and then watch an invention, hoping to see what happens to it. In "Chez Platypus", the boys construct a trendy new restaurant in their backyard.