A/N: Buford's line ("so fellas...) and Isabella's line ("an all terrain vehicle...) are quoted directly from the episode The Secret of Success. The rest of the dialogue is mine. I do not own Phineas and Ferb; I just enjoy writing fanfiction for it.
"So fellas, what's on the menu for today?"
Before Phineas could explain his latest plan for the day, Isabella popped out of the ATV. "An all terrain vehicle. With an electromagnetic motor, super rubber tank treads, high strength ceramic body, hydraulics and all remote controlled."
Phineas stared at her. "Impressive. Isabella, where'd you learn that?"
"From the Fireside Girls Manual." She giggled. "And you and Ferb."
"Us?"
"Well, I've studied Ferb's schematics on a couple things and I've always been interested in engines and hydraulics. Makes for good reading," she joked.
"Cool." He watched her walk away, rattling on about the ATV's complicated hydraulic systems. "Yep. Taught her everything I know."
"Oh please."
Phineas ignored his brother, his eyes still glued to Isabella. "I knew there was a reason I liked her."