Imagine it...you ask for the loan of a $1 bill. You begin folding that bill at your finger tips. When you re-open it, the bill is literally turned inside out! The ends are at the middle and the middle is at the ends!
This is genuine US Currency, it is not faked in any way...it looks absolutely mind boggling. The bill is then refolded and changed back into the normal one dollar bill! A truly wild effect!