"The caller said he had an assault rifle and he had placed explosives in the yard and he was holding a family hostage," said Nathan Elledge, chief of police at the Sammamish Police Department. "He wanted $20,000 to release the family."It turns out that the call was actually made by a computer, and the owner of the home is a top exec at Bungie, the game developer behind "Halo" and the recent hit "Destiny."