Let's see...
A 200mm lens once insolently jumped out of my photo vest near the top of Mt. Thielson in Oregon. It rolled about 200 yards down the scree slope till it was retrieved by an alert hiker behind me. He returned it with a few dings and a loose front element. Got that tightened up and it still works fine.
I left a bag full of Nikon stuff on top of my car and drove off. It hit the pavement; I did not even notice. Some moments later, some jerk comes racing up behind me honking and flashing his light. What an idiot, I though. Only when he pulled alongside and showed me my camera bag through the window did I sheepishly pull over and thank him profusely. Luckily, no damage other than a dinged filter ring on one lens.
After a strenuous hike in the Eureka dunes in Death Valley, I returned to the car as it was getting dark. Set my tripod on the ground, stowed my 4x5 and filmholders and pulled a well-deserved beer out of the cooler. Only the next morning did I notice that my tripod was not in the car. I returned to the location, but no luck. Fortunately, I had a spare with me and managed to find a cheap used replacement at a camera store in Las Vegas. I still have that one.
My spot meter also jumped out of my vest pocket once and hit the ground hard enough to kill it. Quality Light Metrics to the rescue in that case (where you should send you meter if it won't work properly...). That ended that trip though. Now I carry a spare Pentax spot meter with me.
I've managed to only dump over a couple of 4x5 cameras. Luckily, nothing but cosmetic damage. One dousing with a "sneaker wave" was thwarted by my quick-thinking wife and beautiful assistant, who threw her windbreaker over the camera. We both got soaked.
I feel guilty of polluting the environment for the number of lens caps I have "littered" down canyons, in rivers, etc.
Not so bad for 25 years of photography though.
Best,
Doremus Scudder
www.DoremusScudder.com