Per The Family Guy:
Lois takes Peter to an Oral Sex learning retreat. Unknowingly Peter and Stewie have switched bodies in an unfortunate experiment gone wrong. Lois wants to show Peter where, “the kids first apartment is.” The rest of the family desperately tries to invert the process before Stewie has to, “Munch a Bunch of Fritos.” Which entails chomping on Lois kitty. Prior to the chomping of the kitty, the inversion takes place, only to show it was Brian in Peters body doing the chomping…
Let me show you, my kids first apartment…..