Police say a Minnesota mother and her boyfriend shaved the head of her 12-year-old daughter and made her run up and down the street in a diaper because she wasn't getting good grades. A neighbor called police Monday night after a crowd of about 50 people gathered in Fridley, near Minneapolis, to watch the girl, who was also wearing a tank top. Police Lt. Mike Monsrud tells the St. Paul Pioneer Press (http://bit.ly/KliVgT) the girl was crying and hysterical when an officer approached her. Police arrested the couple. They are being held in the Anoka County Jail. Monsrud says both were laughing on the way to jail and questioning why police got involved in the incident. The girl and three younger children have been placed in foster care.