Never? I don't find designing/programming that saddening even though sometimes I just want to throw the computer out the window.

I have certainly had jobs where I wanted to cry about work - not any time recently, I am glad to say - but I don't think I have ever cried at work. On the way home, perhaps.

I worked with one guy who became so frustrated that he smashed his keyboard to tiny bits. He never cried.

if you are about to cry at work, find another place to work at.

One should not forget, its work and you need it for living and not the otherwise, live for working. Billions of people work - you'll find a place where you're happy laughin.