Copybot compiles 50 interesting entries. Here's the one for Parsley Massacre:

In October 1937, Dominican President Rafael Leónidas Trujillo Molina ordered the execution of the Haitian population living within the borderlands with Haiti. The violence resulted in the killing of 20,000 to 30,000 Haitian civilians over a span of approximately five days, which would later become known as the Parsley Massacre due to the shibboleth which Trujillo had his soldiers apply to determine whether or not those living on the border were native Dominicans who spoke Spanish fluently. Soldiers would hold up a sprig of parsley, ask "What is this?", and assume that those who could not pronounce the Spanish word perejil (called pèsi in Haitian Creole, persil in French) were Haitian. Within the Dominican Republic itself, the massacre is known as El Corte ("the cutting").

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