I confess to being rather harsh on possessions in general, and living in England take rain as a fact of life. Earlier this year took a Leica I to London (St Patrick's Day - superb day, thanks to ManGo), and during a short but sharp shower it suffered an ingression of water into its viewfinder that took 4 days of suspension over a radiator to clear.
Realised that older equipment deserved greater respect, and thinking that a modern camera would be less of a worry, bought a Bessa R from CQ.
Again, its the viewfinder that has suffered in the British rain over the summer - after drying out, a small but visible grease mark has been left on the inside of the front glass.
Its easy to open up the back of a camera and remove the lens to facilitate ventilation, but it can be a bitch to drive moisture from a viewfinder. I for one will be more careful when using a rangefinder in the rain.