Halloween on Vega!

On the planet Vega two green disgusting looking alien children wait outside the fence of a house, giggling to each other. One approaches the front door and knocks on it, while the other remains watching from behind the fence. An old alien grandmother comes to door and opens it and lets out a massive squeal before passing out falling to the ground. That’s when the alien child turns around laughing and shows that he is wearing mask of a human head!