1979: During a shooting spree from her San Diego, Calif., home, Brenda Spencer, 16, kills two people and wounds nine others at the Grover Cleveland Elementary School across the street. After firing 30 rounds, Spencer barricaded herself inside her home for almost seven hours before surrendering to police. She showed no remorse for her crime, explaining her actions by saying, "I don't like Mondays; this livens up the day." Spencer was tried as an adult and pleaded guilty to two counts of murder and assault with a deadly weapon. She was sentenced to prison for 25 years to life imprisonment and is next eligible for parole in 2019.