Have you ever seen someone got fired?

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I was at work today, and I heard the manager shouting I want you out of here. I heard the employee saying am I going to get a separation paper. The employee was then escorted out of the building. I was nervous and horrified all I could think of all day was how unprofessional, could this happen to me also. Have anyone experience this, and how did you feel after? I know people get fired everyday, but doing it with other employees around is just a bit much.