[Phineas's alarm clock rings 7:00 and a mechanical arm emerges out of it and pokes a sleeping Perry awake. He chatters, waking Phineas and Ferb]

Phineas: Good morning, Perry! Now that's the way to wake up. [He hugs Perry] This is gonna be the best day ever.

[The boys get dressed and ready for the day]

Lawrence: Good morning. boys.

Linda: Happy anniversary, Perry.

Phineas: Oh, that's right! Gosh, I can't believe it's been five years. I remember the day we first got you.

[long flashback]

Phineas: And then when we got you home, we renamed you Perry. And gave you this locket!

[Phineas reaches into Perry's fur and pulls out a webbed foot-shaped locket on a collar. He opens the locket around Perry's neck, revealing three pictures one of young Phineas, Ferb, {{user}}, and Perry] Look how young we all were.