In a similar way, another Italian card game, "tressette", has a set of formalized signals which you are forced to use (and are limited to) when opening a round, without lying - "i have other cards of this type", "this is my last card of this type" and "I want your strongest card" (I know them as striscio/volo/busso, but they change regionally). So you have a situation where card and signal technically mean one thing everybody knows, but might ask different strategies of the partner depending on his interpretation of the matter, the sequence of calls, and his tactical skills.

Obviously it later generates untold amounts of discussion and fighting over such interpretation, which is what us Southerners fundamentally crave ;)

I have to say, I miss card games. They used to be a fundamental part of Italian education, a social icebreaker and a great generational bridge. Electronic entertainment completely obliterated them, and unsavory vices like slot machines and drugs have now replaced them in public spaces. There are less fights and loud arguments, sure, but it's all very sad.