this one isn't really a bad rejection message so much as a frustrating overall experience
I applied for the PhD program in Electrical Engineering back in December. My grades aren't great but I have research experience and a publication. A professor from the department contacted me and asked me to call him. During the phone conversation he said he was going to recommend me for admission and a few days later he emails me saying that he was going to try to get me a fellowship. This all occurred 5-6 weeks ago and then today I check the website to find that I have been rejected. The message itself was pretty standard, just a we've reviewed your application and cannot offer you admission type of deal, but I thought I was essentially as good as admitted, the shock was rather unpleasant.