Arthur is laughing

I was hearing of Family Guy episode of "A Hero Next Door", about Teletubbies.

(Stewie is reading a book, and then closes it shut)
Stewie: Machiavelli, you've told me nothing I don't already know! [He picks up another book] Ah, Sun Tzu's The Art of War.
(He opens the book as Lois enters)
Lois: Stewie, those books aren't for babies.(She takes the book from him) Here, watch the Teletubbies.
Arthur: She said... (laughs) those books aren't for babies...(laughs) said Teletubbies. (Laugh hystericaly)
Stewie: How dare you! That book, may hold the key to my enslaving of all mankind...(Notices TV) Ooo, fuzzy...
Teletubby: (giddy laugh) Tickle.
Stewie: God, the more I resist, the more intriguing they become! I can't look away!
Teletubbies: Again! Again!
Stewie: Yes! Yes! Again! Again! Oh, dear God, please once more!

Arthur belongs to Me
Family Guy belongs to FOX