I interviewed for one job where they promised me that they would call with the outcome in a few days. A month later I received a postcard (not letter) saying that I didn't get the job. But that wasn't the bad part, apparently my profile remained in their HR system for another 6 months, so every time someone looked at my profile, and then subsequently didn't hire me, I received another postcard. One day I got like 6 of them. "Just in case you forgot we don't think your good enough to work here..."