Display a wood frame, and open the front & back swinging doors. Now show a wood plaque that fits inside the frame with the picture of a black rabbit's face. This rabbit plaque is put into the frame, and now for the magic! The kids yell, "Boo!" The BLACK rabbit changes WHITE with fright! The kids are screaming! When the kids yell "Oob!", (that's boo spelled backwards", he changes back to black again. Finally, after several color changes they realize you are turning the frame around. Take the plaque out and turn it around. Imagine their surprise when they discover a picture of a smiling clown - no rabbit at all! The rabbit's face has vanished! You are left clean!