"What Do It Do?" is the thirty-fifth episode of Phineas and Ferb.
When Doofenshmirtz's latest invention lands in the front yard of the Flynn-Fletcher household, Phineas, Ferb, Candace, and Linda try to find out what it does. When Lawrence won't believe Linda about the invention, Candace decides to use him in a way to show Linda Phineas and Ferb's reverse-engineered creation.
Lawrence is outside putting up a bird feeder and house on a tree. He presses a button and the house opens. He decides that it doesn't do what he wanted it to do but leaves it. In the living room, Phineas and Ferb are watching a program on reverse engineering. It talks about what it is and how to do it. Phineas asks where Perry is once the program has finished and the scene cuts to Major Monogram asking Carl where Perry is. Carl says he came in early. Since Perry has his mission, Monogram decided to go home.Perry is already on Heinz Doofenshmirtz's hover jet and they are both fighting. Perry gets caught in one of the many traps that were set. Doofenshmirtz then tells him about one of his first dates. It was with Linda Flynn-Fletcher and they were in a drive-in theater, going to watch a film. Linda says that she would like to be a pop star one day. Doofenshmirtz sarcastically replies that he will take over the world, and she suggests that he should start small and try to take over the Tri-State Area. Doofenshmirtz says it's unlikely but he'll try. He then brings out a machine to make the movie's sound 5th Dimensional and attaches it to their car. Unfortunately, the machine makes the cinema screen explode and blast off into the sky. Whilst finishing his flashback, Doofenshmirtz trips on one of his traps and knocks his latest machine into the Flynn-Fletcher house in the front lawn. Candace sees the machine and assumes that Phineas and Ferb built it. She calls Linda to see it and says the boys made it. Linda calls the boys and asks what that machine is. Phineas says they didn't build it but they wanted to know what it did. Linda says not to touch the machine, so Phineas and Ferb do some reverse engineering and create a duplicate in the backyard. Linda phones Lawrence whilst he is in the middle of a presentation about the history of Wistershire and Chedderton. She asks what that thing was in the garden and Lawrence says that he made it, thinking it was the bird feeder. He says he has to go and cuts Linda off.
Doofenshmirtz is still in one of his traps and presses a button to release Perry. Perry then tries to steer the jet away from Mt Kilimanjaro. The side of the jet hits the mountain and Perry falls into another trap. Doofenshmirtz then comments that his ship has as many traps as a golf course.
In the backyard, Phineas, Ferb, Buford, Baljeet, Irving and Isabella are trying to work out what it does. In the end, Baljeet and Isabella are having a "romantic" dinner when the machine picks up the candle and is about to destroy it. Phineas tells it to put the candle down and it follows his instructions. Everyone decides that it is an anti-romantic machine. Linda is still out the front of the house and she phones Lawrence again about the machine. Candace is meanwhile trying to get Linda to see what Phineas and Ferb had built. Candace explains that how Linda feels at the moment is how she feels when trying to bust the boys, but Linda doesn't get it. Candace then says that she always drags Linda to the invention. Linda decides to do the same with Lawrence and drags him out of his presentation. Whilst being dragged off, he asks if anyone has any questions. Everyone puts their hand up but Lawrence is out of the room before he can answer them.
Perry escapes his trap once again put grabs the scepter from the statue of the Earl of Whisteshire. He activates all of the traps and steers the hover jet again. Perry throws the scepter out of the jet and it hits the machine in the front yard. Candace is outside talking to Stacy about how she will bust the boys but the machine floats up, covers the mark it made in the grass and flies to the back of the house. It sees the duplicate and they both fall in love. They fly off into the sky just as Linda and Lawrence are getting out of the car. Candace is still trying to show Linda Phineas and Ferb's machine but then she sees them flying off into the sky. She gives up and walks away. Ferb is telling everyone about if you reverse engineer a heart you get love and lots of mushy red stuff. The episode ends in everyone agreeing with a "yeah".
- Vincent Martella as Phineas
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb
- Alyson Stoner as Isabella
- Caroline Rhea as Mom
- Dan Povenmire as Dr. Doofenshmirtz
- Jeff "Swampy" Marsh as Major Monogram
- Richard O'Brien as Dad
- Dee Bradley Baker as Perry
- Jack McBrayer as Irving
- Maulik Pancholy as Baljeet
- Bobby Gaylor as Buford
- Tyler Mann as Carl
- On the drive-in date flashback, Doofenshmirtz's white disco coat turns green when he gets in the car, but goes back to white when the scene changes to the outside POV (when Linda tells him to get the car speaker).
- As Doofenshmirtz's flashback ends, his mouth does not move when he says "And I never saw her again."
- They said Isabella was dressed as a belly dancer. But she actually was a hula dancer. Also in the same scene, Isabella had no bellybutton.
- In the first scene, when Lawrence was giving a bird house, before he pressed the button it has a pole for the birds to stand on. But when he pressed the button and it opened and pressed it again it closes and doesn't have the pole anymore.
- The Roswell UFO incident took place in 1947, not the 1950s.
- This episode depicts Linda mirroring Candace's behavior, trying to convince Lawrence of the strange gizmo as Candace tries to convince Linda of the boys' creations. Despite Candace pointing out this relationship, Linda still doesn't believe her.
- Dr. Doofenshmirtz drove an AMC Gremlin to the drive-in movie theater.
- The episode shows Doofenshmirtz's date with Linda and she was the one who convinced him to try to take over the Tri-State Area. Incidentally, Linda's aspiration of becoming a pop star and how successful she was fulfilling it is in contrast with Doofenshmirtz's aspiration to take over the Tri-State Area.
- The Kronk for Hire cue plays as Dr. Doofenshmirtz educates Perry about- and warns him that he is going to crash into- Mount Kilimanjaro.
- Zanzibar (the name of the band that sings "What Do It Do?") is the name of the episode of a 1996 musical episode of Rocko's Modern Life that won Phineas and Ferb co-creators Dan Povenmire and Jeff "Swampy" Marsh an EMA (Environmental Media Awards) Award.
- Phineas addresses Isabella, Buford, Baljeet, and Irving as "Friends, Bullies, Irving" similar to "Friends, Romans, Countrymen" from Mark Antony's speech in Shakespeare's Julius Caesar.
- Lawrence's tale about Whiskershire mirrors the story of The Pied Piper of Hamelin.
- Towards the beginning of the episode, Phineas and Ferb are seen watching the Uncovery Channel, which seems similar to the Discovery Channel, including the title.
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