Phineas and Ferb built a shrinking submarine so they could retrive Isabella's sash which her chihuahua Pinky ate. Unfortunately, they ended up inside Candace
Meanwhile Dr. Doofenshmirtz has a scheme to get rid of people who can't make up their mind.
- Shrink Ray: One of the things Phineas and Ferb had to choose between to build during the episode. In the end, it was combined into one idea with the submarine.
- Squick: In-universe. When Phineas finds out that they were inside Candace and during her date with Jeremy, Ferb said that it was creepy on many levels.
- This Is Wrong on So Many Levels: See above.