The Adventures of Moldyvort
Halloween
'Avada Kedavra!' Moldyvort stepped over Lilly's body. He walked to the baby in the crib. 'Like taking candy from a baby.' He saw Harry was holding a chocolate bar. 'Oooo, candy.' Moldyvort reached over to grab the chocolate, but Harry hit him with his rattle. 'Owwwww.' He tried again, with the same outcome.
'Dammit!' He was starting to hate this kid. Then, a thought came into his head. It would be easier to take the chocolate from this baby if the baby was dead… 'Avada Kedavra!'
And, that's really how Harry got the scar.