Hey guys, I had a weird encounter today. I took the suburban (my daily driver) on some house hunting, and left it in the neighborhood for about 1.5 hours. When the outing was done, I got back to the Burb and here's what happened:

As soon as I opened the driver door, the chime went loco like it does when you forget the lights are on
As soon as I turned the key to ON, "Service 4x4" came on the info screen, the windshield wipers started going, and my battery gague read dead zero
Turning the key to start did nothing, no clicks no turning, nada

All fuses and relays were good, and I obviously had power because of all the things that were working correctly (windows, wipers, radio, electric locks, etc)
So I get a ride home 15 mins one way, get some tools and come back another 15 mins. Then the truck started like nothing had ever happened?!!

Has anyone seen anything like this??