Jillian's been sketching a picture of a mountain and Barry's banging out the 5-tone phrase on his toy xylophone, when the UFOs pay another visit. Clearly, images and sounds have been implanted in their brains, too.
The spaceship's electromagnetic field messes with all their appliances and electronics, and the extraterrestrials try various ways to get into the house. The scene is right out of an alien-invasion horror film—bright lights, screws unscrewing themselves, windows and doors banging, a force field coming down the chimney.
Jillian tries to protect Barry, but her son follows the lights through the doggy door and is gone, gone, gone.