Ohay, I do similar things. I often randomly play hard core with my pets as an excuse, saying I'm an evil monster and i'm going to devour them and them om nom their head a little, then make them run around more. Or I'll go around the house with my arms out, pretending to be a plane and then crash land into objects or animals. Sometimes I'll stand in a room and just spin as fast as I can. When I was younger, I did this thing where I was crouched on my knees and spun myself around really really fast. Computer chairs are good for spinning, too.
Usually, I just make random noises like animals or creepy noises aliens might make, etc, to random people our animals in the house, and I'll make a scary face. I like saying roar ready deep and growly. Very fun.