Put four matchsticks on the table in front of in the shape of a cocktail glass (shown left). Through clever placement of the matchsticks, you can remove the grape from the glass! To do so, you are only allowed to move two matchsticks. The direction of the glass can change, but not its shape.
The picture shows how the two matchsticks have to be moved in order to get the grape out of the glass, without changing its shape.