The Twilight Zone (1985) : 1x10

The smartest boy in school is a target for bullies. At home in bed after an attack, the boy meets the "Shadow Man" under his bed who offers him a solution. The "Shadow Man" is a serial killer, but tells the boy that it never kills the one underneath whose bed he lurks. In defiance of all the curfews, the boy goes out and taunts the killer to show his courage. As the other kids run, the boy stands confident as the "Shadow Man" approaches, only to be told, "I'm not the Shadow Man under your bed." Parents don't realize that the video their child watches demonstrates magic tricks like turning parents into lizards and giving dogs four eyes. A beautiful woman and her boyfriend plan to kill her husband on the first day of duck hunting season.