(Arthur fantasizes what would happen if he checked out "Hopalong the Frog" for D.W., where he tries to have Ms. Turner check out a book, only for it to set off alarms...)
P.A.: WARNING! Reader is a baby! Adult books are off-limits!! (metal blocks cover many of the bookshelves)
Ms. Turner: (angrily) Sorry, Arthur! The last book you took out was "Hopalong the Frog!" From now on, you can only take out... (echoing) BABY BOOKS!
(Ms. Turner presses a button, and two mechanical arms dress Arthur as a baby and hand him a bottle, and then takes a picture of Arthur dressed that way.)
Kids: (offscreen in sing-song) Arthur's a baby! Arthur's a baby! Arthur's a baby!