I've actually cried twice in the last ten years.
1) At my grandfathers funeral (the dude was 83 I wasn't sad)- I cried more because I realized what an accomplished person he was and how I would likely never be able to measure up to that. I was giving the eulogy and the combination of last minute travel, public speaking ( which I usually enjoy) and the thoughts of my own death and the measurement of my life using his as a yardstick overtaxed my nervous system.
2) Driving away from my family 1 year ago knowing it would be a long separation while doing contract work, and that I was leaving a house that I loved, a town that I loved, and a lifestyle that I loved because of economic pressures of the recession. Something about the highway alone at dusk with that many things you care about fading in the review mirror, caused me to cry for about 60 seconds.
I can feel emotion "well up" but not cry often. A particular Aria, a powerful film (Glory comes to mind) or even a surprise zen moment of perfection with my daughter where the fleeting nature of life and time become more real. But I really don't ever "cry".
Adding: I really consider most emotional "outbursts" to be a total lack of control. I don't yell or have respect for people who do. I have never been in a fight, although I have been punched, and threatened, and even had a gun and a knife pulled on me. I just found a way to diffuse or misdirect the situation. I don't get excited or panic in emergencies. I have saved two kids so far who were choking and their parents did not know the right procedures, put out a brush fire with towels before the fire department arrived (saw it while driving down the road) and chased down and stopped a slow moving car with a man having seizures behind the wheel. Aside from running after the car, I don''t think my heart rate even when up much.
Emotion is useful as an indicator and an experience but if it controls you or you can't control it you cease to be a rational person and resort to more animal instincts. At least, that's how I see it.