Spend 4:30 showing a boy making a fabulous gift for a girl in order to impress and win her heart. At 4:31, show boy with completed gift running to catch the school bus she's on. At 4:36, show girl smiling as she sees boy headed for bus. Cut back to boy by 4:38, smiling at the girl yet not watching for traffic as he darts into the street. Have boy get hit by a van at 4:40, slow motion until about 4:45. Cut to horrified girl screaming behind bus window in slo-mo for another five seconds. Cut to black mid-scream, followed with fade-in of crying children SFX during credit roll.
You can just put "wonderspark" in there for screenplay.