On December 1, 1955 Rosa Parks got on a bus in Montgomery, Alabama and refused to give up her seat to a white person. When driver James Blake ordered her to give up her seat she refused.
When Blake threatened to call the police Rosa responded "'You may do that.'", 1955's equivalent to todays "Piss off"
she was arrested and charged under Alabama's segregation laws.
This caused a 381 day bus boycott which lead to the eventual end of the busSegregation laws.