Heineken WOBO: A Beer Bottle That Doubles as a Brick
A very popular reuse of an item in Germany is using the glass that a certain brand of mustard comes in as drinking glasses. It even says, or at least used to say, on the label that this is a popular thing. Most people I know have a few of them.[0] https://www.bing.com/images/search?q=senf%20tommy%20glas