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Some people say it felt like an earthquake, although they say their homes didn't shake, but they heard rattling of doors and windows. Others thought someone was trying to break in to their homes. Morning coffee in Placentia and the talk centers around what happened Tuesday night. Thousands of people in Orange County felt something between 9 and 9:30 p.m. "At about 9 o'clock, I'd say, there was a mild shaking," said Fullerton resident Daniel Ungerleider. "I felt my windows rattling a lot, and it was only for about 10 seconds."