Prison Break by Smagic Productions - Trick
Your spectator signs a coin, and you place it in a card box with some other coins. With the magic words, their signed coin suddenly appears in a clear, zip bag. Not only that, but upon examination, your spectator discovers that the bag is sealed!
Easy set up - Free hand - Clean ending - Highly visual.
Prison Break will bring you awesome reactions.
Check it out now.
NOTE: This product requires DIY assembly.