While taking a tour of the Panil brewery south of Parma, Italy we were shown these plastic barrels and garbage cans with beer fermenting in them. We couldn't believe it either. Open, spontaneous fermentation in garbage cans.
You can barely see it, but the beer was later transferred into the oak barrels at the top right of the picture for further aging and conditioning. The result is called Divina, which is subtle and delicious, garbage can or not.