When I was a kid, I used to do this a lot; would do it for almost ever little thing that you could possibly think of. If I didn't get something I wanted (such as a pack of candy), I'd cry. If mom didn't make something I asked her to, I'd cry. If I wound up getting some failing grade on a test, I'd instantly start tearing up. Though, I eventually began to change while growing, and now, I rarely do this sort of stuff anymore. Crying does help bring my mood back up in some cases, I'll admit, but in actuality, I'm not doing anything productive at all; it does not do anything to improve who I am. Back then, though, I wasn't very understandable of such things, and controlling this sort of stuff were simply out of my hand, unfortunately; every time I'd run out of luck and something unlikable would happen, water would start falling from my eyes automatically. I'm very thankful that it's finally changed, though. Nowadays, only time you'd see me crying is when my mood's in an extreme level of depression or sadness. Last time this had happened was about two to three months ago, if I remember correctly. Don't really feel like going into detail about it; it's personal, and I'm keeping it that way, haha.