Phineas and Ferb, Season 3

Major Monogram:
Enter. Agent P, we have a situation.

Doofenshmirtz:
Is this about that grape joke? Who told on me? Was it the duck?!

Major Monogram:
That's not why I called you in. Get a look at this! This is Newton the Gnu. He was assigned to Dr. Diminutive, but it appears that some bonehead blew his cover on the blogosphere. We still haven't found out who it was. In the meantime, We need you to bring him in. Get on it, Agent P! Oh, and, uh, take Doofenshmirtz with you.

Doofenshmirtz:
A ride-along? Sweet! I can wear my new fedora!

Major Monogram:
Get out of here! [Doofenshmirtz and Perry leave, then Carl is seen with a mail cart] Carl, get in here! When you're done delivering the mail, I want you to wash and wax my car. You know, a little wax on, wax off? It'll teach you karate.

Carl:
No, it won't.