S6E10: The Prisoner of Benda
(IN BENDER'S VOICE) Well, I'm off to the royal yacht for a quick seduce-and-snatch.
See you! (IN FARNSWORTH'S VOICE) Now, then, Amy we'll simply switch bodies, and then we'll...
No, I'd be back in my body,
but then you and Bender would be switched.
And the Amy and Bender bodies can't trade minds again, since they just did.