I have these moments, but I wouldn't really say mine are random. It usually is triggered by something, something that brings back a memory or gets me thinking about a particular event in my life. I would think that these bouts for you would have to be triggered by something. Could it have something to do with your job? Or is there anything around you when these bouts happen that would cause a sort of memory reflex?

Those are the sorts of questions I would be asking myself. I also firmly believe that a good cry can be a good thing, even for us men (which I assume you are judging by your name). When I am feeling that urge, I will usually wait until I am home alone and I will listen to some music and just let it out. Then the next day is a new day and I go about my business. It might not work for everyone, but if the urge is there I do feel we need to let it out even if no one really wants to feel sad. We were born with emotions for a reason, and I feel we are supposed to experience them all in some form or fashion.

Also, as for your last part, I think that is entirely possible. Remember, too, just because it may not be "normal" for other people doesn't mean it isn't normal for us. We are all built differently and things affect us differently.