Watch the full episode of Phineas and Ferb "Crack That Whip / The Best Lazy Day Ever!" Phineas and Ferb set up a roller derby rink so Grandma Betty Jo can skate against her arch rival! It's such a nice day that Phineas and Ferb have decided to do nothing.

Watch the next Phineas and Ferb video here:    • Boyfriend From 27,000 B.C. | S1 E19 |...  

Watch Phineas and Ferb on Disney XD! And check out more Phineas and Ferb full episodes here:    • Phineas and Ferb Full Episodes  

Phineas and Ferb invent, scheme, and stay one step ahead of their sister Candace who just wants to catch them up to no good! Their pet platypus Perry lives a double life as a secret agent whose sole mission is to foil Dr. Doofenshmirtz's plans.

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