You set down a can. You have a borrowed coin signed. You hold it on your outstretched hand. You flick it toward to can, which instantly falls over. No threads. No risky time-based or gravity switches. It falls over. The coin has seemingly travelled through the air and landed in the can.
You empty out the contents, and it is indeed the signed coin. Bow and enjoy your applause.
What you get? An amazing, James Bond-like gimmick.