You can't just join any universe in the middle. Elliott leaves the room with his baseball and glove and walks down the driveway in the rain and mist. As Elliott walks slowly back up the driveway to the house with the pizza, he hears sounds coming from near their home's backyard toolshed. Laying the pizza on the ground, Elliott casually tosses his softball into the shed - it is playfully thrown back out to him. It's in the toolshed.
Nobody go out there.
Members of his own family don't really believe him, but to play along and ridicule him, the boys jump up from the table, grab kitchen knives and a flashlight and enter the toolshed. Although they find a few odd-shaped tracks in the dirt, Michael believes they are only the tracks of coyotes that have returned to the neighborhood. After they return to the house and Elliott has angered one of Mike's friends by telling his Mom who ordered the pizza, long alien fingers slowly wrap around the side of the shed door. In the middle of the night in Elliott's bunk bedroom, the family dog senses something stirring outside. Elliott returns to the backyard with his flashlight.