A childhood belief about aliens

When my brother was younger, my father and I told him that he was adopted and that we had actually found him in the yard, dropped off by aliens. We told him that one day the aliens would come back to take him back to his home planet. One night, my father went outside and shined a flashlight through the window on the ceiling. I told my brother is was the aliens returning to take him away. He darted under his bed and couldn't be coaxed out for a couple of hours. After that he rarely believed anything my fathr or I ever told him.