The gang builds a giant snowman which somehow comes to life and threatens to destroy Danville.
The "Too Young" Line
I have an idea.
Isabella: So Phineas, Ferb, whatcha doin'?
I know what we're gonna do today
Hey, where's Perry?
Phineas: Hey, where's Perry? [beat panel] Ah well, back to the snow.
Perry's entrance to his lair
Isabella: I made a snow angel!
Baljeet: I made a snow mathematician!