Who's Who? is a song sung by Candace, Phineas, Isabella and Irving while they have swapped bodies.
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Lyrics[]
Candace: No way, you’re Irving! I’m not falling for your tricks, I can tell who’s who. You think you can confuse me, but I tell you that you’ll lose!
Irving (Phineas): Candace, you got it wrong. I’m Phineas, not Irving!
Phineas (Isabella): I’m Isabella.
Ferb (Irving): And I would be Irving!
Candace: CUT!