This is a coffee can magic trick created and developed by Toshiaki Kobayashi. A coin (borrowed is fine) is signed with a marker pen. The magician takes out a can of coffee and shows it to the audience. This is a type with a screw-on cap, a common, ordinary aluminum can. The inside is empty (the lid can be opened and shown upside down). The coin is placed on the hand, the can is placed on top of it, and with a light shake... the coin penetrates the can and ends up inside!? Even after showing both hands, the coin is nowhere to be found, and the can is shown, with the bottom and sides examined, but there's nothing suspicious. Then, when the can is shaken, the sound of a coin inside can be heard. When the cap is opened and the coin is taken out, the coin undeniably appears from inside the can, and indeed, it has the signature on it.