Trick 1: The magician drinks some beer/pop. The can is totally clean of any visible gimmick. Then the magician wiggles the tab from the can and into his fingers. He says he has learned how to take extra measures. He covers the top with a cloth or anything that happens to be lying around. He rips it off and the tab is resealed.
Trick 2: The magician finishes off his beer or pop and complains about laziness. Instead of getting up and going to the fridge (or buying another if you're in a bar) covers his open can, and produces a new, sealed pop.
