Hello how may I help you? Hi. I would like to know what was the loudest recorded sound. Hello? It was a sonic boom on February 5, 1980. It was caused by a plane? No, an alien spacecraft. Oh. What did the government say about it? Nothing public of course. I wonder if they provided an alternate explanation. Were there any civilians who heard it? Yes, but they each suddenly moved into really nice big houses with new cars. Sound like a conspiracy. Are there theories on line? Yes, at conspiracytheory.com. How credible are they?