A few years ago, a friend and I were hiking up to a pass near Telluride, CO in summer (August). We were a little slower than planned, and didn't make the pass before the storm hit. We hustled back down, first in hail, then rain. My kit for the day was a K-5, FA20-35, FA31, FA77, and a DA18-55 backup for inclement weather. The FAs, which had done a marvelous job on the way up, all went in the waterproof bag, but I thought: "This is just the time to really test out the weather resistance of Pentax equipment". So the 18-55 went on the K-5, and this combo was deliberately left out in the elements for the full trip down, in the pouring rain, hanging on my chest from the neck strap. We got soaked. 3 hours of rain out of the 4 hour trip down, with some pictures taken here and there. Nary a problem, on the hike down or later on. Just wiped it off with a towel when we got down. Still working today. Pentax is tough, certainly in this case.
I actually don't consider that abuse - it was a deliberate test, with possible fatal consequences for the kit.