It works like this:
On one of the sides of the butter box, carefully cut around the bottom and sides of the butter box she is holding with an exacto knife, so it can be flipped up.
Cut an indian girl from another box, or a different side of the box, and position her knees in the opening you have cut. Tape her in place, and press the flap closed.
Now tell a gullible friend that if you cut open the butter box and flip it up, the Indian Girl's naked breasts will appear.
Carefully pretend to cut the box open and flip it up. Take away their beverages before you do this.
Someone performs this trick at our house at almost every holiday - it has been done to all new girlfriends, boyfriends, neighbors...
And now, thanks to Jim, you can see it for yourself!