Prologue
"Hey, Phineas. Whatcha doin?"
"Oh, hey Isabella. We're just finishing up on this project. It can turn anything inorganic into food."
"Oh." Isabella looked a little disappointed. "Phineas, can I have a word with you?"
"Sure." Phineas motioned for Ferb to go inside.
"Phineas, your projects are cool, but what about their safety? You remember the treehouse you built last summer? The one with the tube tunnel thing?"
"Yeah, why?"
"You didn't test it out beforehand."
"But you-"
"Look. What happens if you put a part of yourself in it?"
"I don't-"
"Know. Exactly. Try it."
So he did. Nothing.
"See?" He said. "No one's been injured on our equipment."
"Yet. Look, Phineas. Someone's going to get hurt someday, and I don't want to see that happen."
"But-"
"Look you stubborn ox! Sometimes I wish I'd never met you!" And with that, she stormed off.
Phineas was stunned and heartbroken. "Hey, Ferb?" he called out, "I'm gonna try this out camping with Baljeet, 'K? I should be back tomorrow!" Ferb thought he saw a tears in Phineas' eyes but he shrugged it off and nodded.
And with that, Phineas cycled off into the distance.