Some friends and I were in Southern Wales and we stopped off at the annual Bog Snorkeling competitions. No, that wasn't the dumbest thing I've done. I had been shooting with my 80-200mm and decided to change lens and get kneel down and get my camera close to the water for a close up of the swimming competitor. I changed lens and handed my camera bag back to a friend to hold while I crouched down. Unfortunatly I forgot to completely close the zip. She turns around with the bag on her shoulder, bag tilts, lens rolls out of the bag, and in slow motion falls ever so gracefully into the bog in front of me. Lesson learned.