Does This Duckbill Make Me Look Fat?

 

After watching an old sci-fi movie, Phineas and Ferb are inspired to create a teleportation device which causes Candace and Perry to switch bodies. Meanwhile, Dr. Doofenshmirtz has a grudge against a company mascot.
Episode Summary

Phineas and Ferb are watching an old sci-fi movie about a man who created a teleport device. One of the characters threatens to remove the tongue of another character, so when Phineas says what they're going to do today, Ferb immediately covers his mouth. Phineas quickly reassures him that he was talking about creating their very own teleport device, not removing anybody’s tongue.
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Just then, Linda crawls in and asks the boys if they have seen her earrings. Phineas asks her which ones they were (dangly, smoky topaz or the hoops) and Linda says she lost her hoops, which Phineas instantly interprets to mean that she’s wearing "the blue dress." Phineas tells her that they'll keep an eye out for it and once she has crawled away, the boys run out to the garage and start building their teleport device.

Ferb does most of the building, while Phineas handles ordering the supplies and materials, and soon the teleportation device is complete. Phineas wipes the sweat off of his brow and asks where Perry is.

Candace wakes up and sees Perry sleeping on her bed. She strongly rejects, saying, "Eww, you're not supposed to be here!", picks Perry up, and storms out to the garage to tell Phineas and Ferb to keep Perry out of her room.

On her way, she stops by the kitchen to tell her mom that Jeremy is coming over and to try not to embarrass her again. Linda asks what she means, and Candace reminds her of an incident at her 5th grade graduation that involved something inflatable.

Phineas and Ferb are about to take a picture of the completed teleportation devices when Candace jumps in front of the shot asking them how many times she's asked them to keep Perry out of her room. She then takes notice of the teleporters, but just as she's racing inside to tell Linda, Candace trips on a wire in the garage and falls into the one of the teleportation devices with Perry.