This was one of my favorite books as a child. By the time my nephew was 1 yrs old he could do the "BZZZZ" part without being cued. Now, I've been reading it to my son, and he's beginning to read it back to me. There's just something very "comforting" about this book. I'm finally breaking down to buy a second copy, as my orignal copy is in many pieces and don't think it will survive long enough for our 2nd child to enjoy it.