Sounded like a load of waffle to me

6:30 AM Saturday morning - Olivia & Sophie are up

Olivia: (whispering) Mom, what day is it?

Me: (laying on the couch with my eyes closed) It's Saturday.

Olivia: (getting very excited) Mom, you said on Saturday you'd make waffles!

Me: (groaning, opening my eyes) Did I?

Olivia: Yes! Yes! Yes, you did!

Me: (getting off the couch) Let's do it.

So we did. 

(Can you name which book this post title comes from? Without googling?)