Organized crime boss Whitey Bulger goes into hiding after being tipped off by his FBI handler about an impending arrest. The convicted murderer stayed out of sight for 16 years causing great embarrassment to the American Federal Bureau of Investigations. He was finally arrested in 2011.

Slovenian referendum on independence from Yugoslavia. The Eastern European country had joined the Socialist Federal Republic of Yugoslavia as a socialist republic state in 1945. Actual independence for the country did not occur until June of 1991, when the Slovenians rejected Yugoslavian interference in the form of a 10-day war that ended on July 7, 1991. A new constitution for the country came into force on December 23, 1991.

Metric Conversion Act signed by U.S. President Gerald Ford. The act made the metric system the preferred system of weights and measures in the United States. Today, the metric system is predominantly only used by scientists and academics in the U.S. Common people tend to follow the customary units that were developed before American Independence. The U.S. is 1 of 3 countries in the world that do not use the metric system. Liberia and Myanmar are the other two.

Tokyo Tower opened to the public. At 333 meters tall, it is world's tallest, self-supported steel tower. It is based on the Eiffel Tower and is used for communication purposes.

Vincent van Gogh cuts off his ear. It is now believed that the Dutch painter was suffering from a psychotic break at the time of the event. After cutting off his left ear, van Gogh bandaged his head and took the severed ear to a prostitute for safekeeping.