SPRING HILL —The idea came in a cough syrup buzz.

Early Friday morning, reports say something told Cory Lee Murphy to kill his father with a hammer while he slept.

Earlier in the night, Murphy, 17, stole cough medicine from a dollar store on County Line Road and couldn't remember how much he took, he told deputies.

Later, he tried to hot wire his grandmother's car in his home's garage with a screw driver, a Pasco County sheriff's report states. He gave up when it didn't work and left the ruined ignition.

Then he grabbed a hammer from the garage and "was having thoughts of killing his father with it," the report states.

But instead, Murphy was trying to leave the house at 18123 Drayton St. when his father, Robert Murphy, 51, caught him. Cory Murphy bashed him in the head.

Someone called 911. Deputies found the elder Murphy in the driveway, bleeding profusely. He told them he managed to snatch the hammer from his son and leave the house.

Deputies arrested Cory Murphy on charges of aggravated domestic battery and attempted grand theft auto. He was taken to the Land O'Lakes juvenile assessment center.