(Scene opens up at night, showing Phineas, Ferb, Candace, and Perry in front of a house.) Phineas, Ferb and Candace: Trick or treat! Man: Well, now, would you look at this, Martha? We've got Frankenstein, Count Dracula, and some kind of Igor, or something. (Perry chatters) Man: And if it isn't little Candace Flynn! Where's your costume? (Song: Were-Cow) ♪ Well they've got pitchforks and other implements of farming, ♪ ♪ I don't think they're in a planting mood. ♪ ♪ Yeah, we got a were-cow, ♪ ♪ Were-cow on the run! ♪ ♪ And they look like they got a score to settle! ♪ ♪ Were-cow! ♪