Crying During a Speech

Giving a speech can be a time of high emotions. Yes, public speaking is the number one social fear so a lot of folks probably want to cry when they give a speech. And even the most experienced speakers feel a bit nervous and give speeches that don’t go as well as they had planned. So I guess everyone has the potential to want to cry during a speech. But on a more serious note, there are other times when giving a talk might get the most of our emotions. The question: is it appropriate, or professional, to cry when giving a speech?