Last Night I scared My little brother

So I'm 15, and my parents are divorced. My dad is remarried, and him and his wife rent a basement here in Saint George. Well, there's only two bedrooms. So the three children share one bedroom. We each have our own sections of the room, and our own beds. I'm the oldest, my sister is 13, and my little brother is 8. At about 11 last night I told everyone to turn off their devices so we could go to bed. It was pitch black. Taking this perfect opportunity, to scare someone. I rolled out of my bed silently, and crawled on the floor. Taking care not to make a single sound. i could hear my little brother talking to himself and giggling, as I slowly stood up at my brothers bedside. Than suddenly I fell forward onto the bed, landing on him(not hard enough to hurt him of course) and yelled "Roar!" And my little brother just started screaming! However, only five minutes later he wanted the lights back off and wanted to sleep But he made me promise not to do it again