Will you hide your mistakes from your boss?

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It is comforting to know that my boss appreciates my work. My co-worker said that she overheard my boss the her boss discussing about me and the subject of their interest pleases me (i have to admit). I also have to admit that i've done a lot of errors on my job and that most of them are the same mistakes. Once upon a time i've made the same mistake again and i figured that i can hide it from my superior. And so i did. I've change the details, hid the printed (wrong) page and printed the corrected one, i've sneaked at her executive table and changed her copy as well. About a month later, she asked the file.. She have not yet discover what i've done. Anyway, before i gave the file to her, my conscience is bugging me. I've decided (after all the sneaking i've done) that i should confess. Well, i did not told her that i tried to hide my mistake, i just gave her the original file so she will find the error herself. She did saw the error so she called me over the phone and showed the same scary-part-of-her she shows me when there are errors on my work... Have you ever done the same? If not, have it cross your mind?