Phineas and Ferb2007

Grandpa Reg:
[finishing his story] And that is why there are pumpkins.

Phineas:
Um, Grandpa, you were telling us about a platypus monster.

Grandpa Reg:
Ooh, that sounds very exciting, tell me about that.

Phineas:
But you were... I mean... I didn't... [sighs] I got nothin'. Ferb?

Ferb:
Platypus monsters are the only monsters to lay eggs.