In 1965 two astronauts on their way back to orbit spotted something in space they couldn't identify. Frantic, they radioed Mission Control. After several minutes of tense silence, engineers at Cape Canaveral began hearing the faint jingle of sleigh bells followed by a harmonica rendition of "Jingle Bells" ... played by none other than the two "frantic" astronauts. The men later donated the harmonica and bells to the National Museum of Space & Aeronautics in Washington, where they now sit on display.
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