Effect:

Make the President, Monarch or any other face on a bill of money, appear to frown and then smile.

Solution:

• Make one fold along the corners of the eyes and mouth on each side of the bill.
• Bend the area between the folds so that there appears to be a concave or "U" shape in the middle of the face.
• Tilt the bill back and forth and you should see the face smiling and frowning. See example below.