You hand out an ordinary safety pin to be examined. You then borrow a dollar bill, slowly stick the pin through the bill, and lock it shut for maximum security. Then you do the IMPOSSIBLE and slowly pulls the pin through the fibers of the borrowed bill! To finish, you can either pull the safety pin off the bill and hand out everything to be examined by forensic scientists OR you can even leave the pin sticking through the borrowed bill, and hand out everything stuck in an impossible state.