Let me see,
My princeton tech pulsar 2 failed me in a blackout.  My coleman peak one stove had a seal break inside the pump about two days into a field exercise.  Never loan your prize gear out, I learned that.  A bicycle pump broke when I was trying to repair a flat. I have had numerous cheapo knives just refuse to work, ie cutting, opening, etc.  I bought those because I thought they were cool and all, but they were crap.  
I have had articles of clothing fail as well, mostly in the zipper or button areas and I have had lots of shoe and boot laces break for no reason, or at least that is what I am telling myself.
Good thread,  talk to you later,
garrett 
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On occasion of every accident that befalls you, remember to turn to yourself and inquire what power you have for turning it to use. - Epictetus