Best simple magic trick I've ever seen, blows people's minds:

Cut out a piece of black paper the shape of the opening of a beer can, lick it and stick it to the lid. From a distance it should look like it's open. Prick a hole in the side with a pin and drain out a quarter of the beer, enough that you can squeeze the can and bend it. Lay it on its side on a table, with the pinhole pointing up so it doesn't leak. Now it looks like an open, empty, crushed can. Do all that secretly obviously.

Now ask someone if they want a drink, and point out the "empty" can. Pick it up and cover the pinhole with your finger, then subtly wave the can around as you magically summon more beer. The remaining beer will fizz up and the pressure will cause the can to inflate and uncrush itself. Secretly remove the black paper and hide it. Show them the magically restored lid, crack it open an pour the beer into a glass (so they don't notice it was partly empty).

What makes it so incredible is you never hid the can from them or did anything tricksy. From their POV, an empty can just refilled itself in front of their eyes.

Edit: Here's David Blaine doing it for some obvious actors. You will be able to make it more convincing than this. Can't believe David Blaine was so popular back then lol https://www.youtube.com/watch?v=CUTG-MIqU-Q