I was ready to post a book until I got to the bolded part. Hmmmm I may have to think awhile if I can't choose sarcastic ones. :p hehehe
Okay I've got one.. When my dd was little (she's my high functioning kiddo) I would always say to her, "You're so.........." and let her fill in the blank which she would say, "good" or "smart" and I would say, "you're the best girl in the whole wide....." and she would say, "world" and I would say, "I love you so....." and she would say, "much" and I would say "I love you to the moon...." and she would say, "and back again" and I would say "that's right" I used to say it to her every day. She still remembers it even now and can fill in all the blanks. :)