(Scene opens at the Flynn-Fletcher house. Cut to the backyard where Phineas and Ferb are surrounded by lots of leftover parts.) Phineas: Ferb, we've got a lot of leftover parts from the last time we used leftover parts. There must be something we can do with them, you know, besides hodgepodges or art pieces. Buford: Whoa, dudes, what's with all the junk in your backyard? It's like an obstacle course back here! Phineas: That's it! I know what we're gonna do today! Buford: What'd I say? Phineas: You said obstacle course, of course! Buford: Oh, I meant to say chili cook off. Baljeet: Are you meaning to tell me we have never made an obstacle course this entire summer? Phineas: Ferb? Ferb: I'm filled with remorse That we haven't, of course, Even thought of building an obstacle course. Phineas: