I attended a parade with my 6D and 70-200 II. I'm in SoCal and we were going through a 3 yr drought, so I didn't expect to encounter any rain.
But it did rain - mostly light rain and I tried to keep my camera under my jacket most of the time. But enough water got on it to cause malfunction. The rear LCD screen began to flicker like crazy. The ISO, AV and TV settings were jumping around by themselves. I lost control over the camera but keep shooting, and still got some good shots.
I was sure my 6D would require a trip to Canon's service center. But after setting next to the heater for a couple of hours, operation returned to normal.
I'm gonna keep one of these in my camera bag...