2002 electrical failure

:mad: 2002 Taurus SE 3.0 91000 miles. No prior problems with battery or electrical system. Came out to start in morning and battery was DEAD. Nothing was left on. Tried jump starting and only got solenoid clicking. Replaced battery and all is fine. I have never had a battery failure like this. Is it something quirky to the Taurus? Any comments or insight welcome. Bob