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It was never illegal to sell bananas using only metric measures as we were allowed to use supplementary indications for a limited period which was extended several times due to public resistance to the metric units until 2009, in 2009 the requirement to ultimately cease use of traditional units alongside metric units was finally removed.
Well - I think that works both ways - but here's a trick: consider the context!
When someone say use an "eight ounce cup", I would imagine only a very very small portion of the population would imagine that meant that one should weigh the vessel to determine its appropriateness for use. They'd probably jump to the irrational conclusion that it must be the cup's measured volume which they need to ascertain.
And I was talking in relation to "pint" - which sort of clarifies everything to almost everyone.
I suppose most people know that historically, an "inch" was the length of the outer joint of you thumb. When people disagreed, the thumb of the king settled the disagreement. Different countries had kings with different kings, so when the inch (or "tomme" - the name of the thumb in Nordic languages is "tommel") was normalized, each country set its own standard. The Norwegian "tomme" was set to 26,2 mm (as opposed to the US 25,4 mm) - Norwegian kings had big hands!
In the 1970s, there was this Norwegian computer company, "Norsk Data", who had grown so large that they started buying components such as power supplies from other vendors. These were made to fit into 19 inch racks, and the Norsk Data guys had to put together their first racks. But they were so roomy - the power supplies were about to fall down!
It was soon discovered that those building the rack had made them 19 * 26.2 mm = 498 mm wide, rather than 19 * 25.4 = 483 mm wide.
In informal Norwegian speech, "half a liter" can be used as a measure of time: "I have been sitting here for about two half liters" or "I've got only a half liter or time". It is rarely used outside the pubs, or when referring to pubs.