pamcake puns--not for the faint of heart

Conversation during last weekend's Infamous Saturday Pamcake Breakfast at Sullivans', The Oklahoma Files:

Courtney: The older I get, the sicker I get anytime I go on amusement park rides. I used to love them, but now I can't handle them anymore.
Jennifer: That's because your vestibular system changes as you get older.
Courtney: My what?
Jennifer: Your vestibular system.
Courtney: I have a vestibular system?
Joel: Do you feel self-conscious now?
Courtney: Yeah, I do...I don't know if I want people looking at my vestibule.
Jennifer: Not vestibule, vestibular.
Pam: Is that Ferris's brother?

;oD