Keeping bad or negative stuff

Have you ever kept anything that was either a reminder of something negative or perhaps a bad report card or review? Why do you keep these reminders?

I have one that I cannot throw away. Before I began to work where I am currently, I received a horrible review. I had never received a bad review on a job ever. I might have had some that were average and some that were very good or excellent, but I never received a review that pretty much said I was failing or doing poorly. I keep it now more for laughs and to reflect how much better off I am now. It was also a report that was full of falsehoods. Policies had changed in my company and they had to rate a percentage of individuals as poor and because of employees being hired in the past year and a few on leave at my level, I was the scapegoat. My boss agreed that I did not deserve the rating, but he had no backbone to fight it.