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A piece of paper you get when your boss kicks you out of their office and says you're no longer their problem.
My boss handed me a P45 and said, 'You're out of here. Don't come back unless you're rich and famous.'
I got a P45 and a free coffee from the office canteen. That's the worst part of being fired.
My P45 was so long, I thought it was a contract for a lifetime of misery.