The Heineken World Bottle (WOBO) was dreamed up by then-CEO "Freddy" Heineken, who decided that trash wouldn't end up on beaches (he was in the southern Caribbean at the time) if it could be repurposed as building materials in houses. He realized that if Heineken bottles could be reused as bricks they might actually make a difference for affordable housing.
The architect John Habraken went on to design a bottle that would actually be a reasonably safe brick alternative. The WOBOs could stack horizontally because the bottoms had an indentation that fitted with the necks of the other bottles and the sides had patterns of bumps that interlocked as well.
The bottles weren't perfect but in Heineken's test run of 100,000 (the amount needed to build about 10 small houses) they did the job. The bottles were never mass-produced, though. As Mark Wilson points out on Co.Design:
I can’t help but wonder if the WOBO was simply a product ahead of its time . . . We’ve grown to expect corporate social responsibility, and as consumers, we’ll go out of our way to subsidize it.
It could be kind of great to have a house made of beer bottles. Especially for people who really just need any house at all. Okay crowdfunders, deploy! [Co.Design]