As a New Yorker myself, we all know very well how U.N. diplomats abuse not only NYC's parking regulations to the tune of millions of dollars in unpaid parking tickets, but they also commit serious and injurious traffic violations with impunity.
Here are a few instances where U.N. diplomats abused the people of New York with their immunity to our laws:
Shoplifted raincoats from a New York department store? An Iranian envoy did just that in 1984. Claim that your German Shepherd, who’d bitten several neighbors in Pelham, New York, was protected by immunity and any action against the dog would lead to “possible international consequences”? A delegate from Barbados made that argument (and won) in 1975. Smuggle 40 kilos of cocaine from Mexico to New York in a diplomatic pouch? Ecuador diplomats tried it (and got away with it) in 2012.
Quoted source:
How Diplomats Commit Crazy Crimes
Reading the above linked article also reveals which nations the worst offenders come from, and I suppose it's no coincidence that these are also the nations that "happened to score low in the annual ranking of public corruption compiled by World Bank researches": Kuwait, Egypt, Chad, Sudan, and Bulgaria.
The United Nations, I believe, is an institution about which one might say: "It seemed like a good idea at the time..."