The Taco Liberty Bell was an April Fool's Day joke played by fast food restaurant chain Taco Bell. On April 1, 1996, Taco Bell took out a full-page advertisement in seven leading U.S. newspapers announcing that the company had purchased the Liberty Bell to "reduce the country's debt" and renamed it the "Taco Liberty Bell".
It was an Aprils fools prank at first but then it became the real thing.