What's funny about this (apart from your excellent joke) is that there are actually a lot of places, where they are a common crop, where bananas are advertised as "boneless". This is because, I believe the bit that connects the banana bunch to the plant (not a tree!) Is sometimes called the "bone" (I believe it's "C" in this image:
Having the grocer machete this bit off for you presumably cuts down on the unnecessary weight on your moped back home, and maybe even the costs, if buying by weight.
Caveat: This is just what I have come to understand, from travel experience and curiosity. If there are any actual "Bananologists" about, please feel free to correct!
I may be wrong on this but I'm pretty sure I've seen some seemingly redundant "no gluten", "lactose free" or "vegan/vegetarian" labels on a lot of products in german and austrian supermarkets. Could be that these products are labeled that way because they were made in an allergen free environment i.e. no parallel production of something containing these allergens.
gelatin and isinglass are often added to remove impurities and yeast left from the fermentation. They are removed afterwards, but the wine can't be called vegan anymore.
Unfortunately there are very few redundant "vegan" labels since even plain sugar can be non-vegan (being processed using bone char) not to mention a ton of different fats, colourings, and other additives that can all come from either animal, plant, or synthetic source, and unless the manufacturer confirms, as a customer you have no way of knowing which it is, unless they've labelled it.
Some apple juices contain an ingredient called isinglass which is made from dried fish bladders. And some apples may be waxed with beeswax (from bees) or shellac (from bugs) before being juiced.