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Personally, I'm somewhat curious (from a historical perspective) about how often a nation's constitution becomes effectively irrelevant to the functioning of its government, and how long it typically takes for this to happen. The following quote sums the situation up pretty well for the US, but I'm curious to know if this is a completely general phenomenon, or on what factors this sort of thing depends:

"It took about 150 years, starting with a Bill of Rights that reserved to the states and the people all powers not explicitly delegated to the federal government, to produce a Supreme Court willing to rule that growing corn to feed to your own hogs is interstate commerce and can therefore be regulated by Congress." – David Friedman, The Machinery of Freedom