Over the last two weeks, residents in South Dakota and California experienced strange mystery booms that shook homes, jiggled windows, and definitely rattled a few nerves. At 2:00 pm, on November 7th, the residents of the Black Hills area in South Dakota heard a large boom that shook their windows, and vibrated their houses. That very same sound was heard as far as Nebraska and Montana. According to Lane Pilster, a rancher in Alzada, Montana. "The beginning of it was intense, but then faded off with a dull rumbling like a jet was flying by. The sound probably lasted about 8-10 seconds…" According to the Black Hills Pioneer, no seismic activity or meteorological events were reported, and no industrial companies took responsibility for the sound. Earlier this week, at 2:30 pm on November 15th, residents of San Jose experienced what felt like a minor earthquake with reports of a strange boom sound. However, no earthquake occurred. Susan Garcia, a spokeswoman with the U.S. Geological