Judy Moody, Mood Martian (Book #12)

Will the real Judy Moody please stand up? In honor of Backwards Day, Judy Moody decides to turn that frown upside down, make lemonade out of lemons, and be nice to stinky little brothers. In fact, Judy becomes a NOT moody, cool-as-a-cucumber neat freak for one whole entire day. But when her combed hair, matching outfits, and good moods hang around for days after, her friends begin to worry. Could this smiley Judy be an imposter?