"Who's that?"

Phineas and Ferb sat against the tree in their backyard,

"So Ferb, what do you want to do today?" Phineas asks.

Ferb shurgs.

"Hmm... Oh I know! We should build a defensive fort. You know sort like with Thaddeus and Thor, but this time, it is made to keep people out better." Phineas says. "Lets get started."

A few minutes later.

Phineas and Ferb are standing on the third floor of their project.

"Hey, where's Perry?" Phineas asks. "Or for a matter of fact, where's Mom, Dad, and Candace?"

Ferb shrugs then says "Mom, Dad, and Candace are at the mall, shopping."

"You know, it's kinda weird," Phineas says stretching his arm to lean against a pole; "Without Candace, it feels rea-"

Phineas hand misses the pole and he loses the balance and falls.

"AHHHHHHHH!" Phineas yells as he falls down two stories.