I Scream, You Scream is the 15th Episode of the Disney Channel Original Series Phineas and Ferb. The US airdate was Febuary 17, 2008.
Plot[]
The boys make the biggest ice-cream maker for Isabella after her tonsils are taken out; Doofenshmirtz's daughter, Vanessa, spends the day at his lair and tries to convince his ex-wife (voiced by Allison Janney) that he's evil, in the same style as Candace to Linda. This episode also marks the fact when it's revealed that Ferb likes Vanessa Doofenshmirtz, when he says "I was weak" after he picked up the wrong blueprints.