1973 saw the debut of Envirite (aka Glass-Dung, Manure Glass, or Pasture Glass), a promised-to-be revolutionary building material made out of glass and cow manure.
It actually seems like it was a pretty good idea. The concept was that you could take old glass bottles, combine them with cow manure, heat both together in a furnace, and the manure would act as a foaming agent fusing the glass together into a versatile building material. So you'd be repurposing two waste products (old glass and manure) into something useful.
The problem, it seems, was actually getting architects and builders to use the stuff. I found a 1990 article that credited the "inherent conservatism of the building industry" with denying us our glass-manure houses.
Somewhere in here there's a joke about what people who live in glass-manure houses shouldn't do.
Lansing State Journal - July 25, 1973
Los Angeles Times - Aug 23, 1973
The Alexandria Town Talk - July 26, 1973