I worked for an employer who had a large percentage of union employees. All employees were held to the same rules and as a result, you could only be out sick twice in one year. The third time meant you were written up. If you were out more than a day, you had to have a doctor's note. I had a procedure done and was so terrified about the rules, I went to work. The pain was unbearable and they sent me to the on-site doctor. He looked at my stitches and asked why the hell I came in. I could barely laugh through the pain at the irony of it.