So it's completely natural for anyone going through the dreaded process to feel a range of emotions - including intense anger and shock - which can prompt them to say or do things they will later regret, says Michael Kerr, an international business speaker and author of "The Humor Advantage."
"It's important to remember that being unprofessional in any way could do long-term damage to your personal brand and reputation," he says.
"You need to keep in mind that most successful people have been fired at some point in their life. It's a temporary setback that won't ruin your entire life, and it isn't necessarily personal."
Remaining polite and leaving with your head held high will help the transition immensely, he adds. "Do you want to leave in such a way that it will only reinforce the impression that they made the right choice in firing you? Or would you rather leave in such a classy way that your boss remains as supportive as possible during a very difficult time and remembers you in a more positive, professional light?"
As difficult as it is at the time, the best course of action is to try and keep a level head and not burn any bridges. "Take a deep breath and err on the side of saying nothing if you feel you can't keep control of your emotions."
Here are 13 things you should always try to say to the person firing you if you want to leave on a high note: