I really like this thread -- its more of a tell us you worst rejection story. I've had my share.
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I'm still annoyed by a rejection on a Car Wash project. The job required you to get a "Platinum Plus" Car Wash. The problem was there were two Platinum Plus's -- one that was accepted and the other had interior conditioning was rejected, but both had the same name. The msc did not budge.
I had a BWW's one from a few years ago (not sure if still shopped but this was 2-3 msc vendors from the last one I've seen them use). I completed the report, thought I submitted it. I later received an email notifying me of a late report then 30 minutes later cancelled -- never had a chance to go back into Sassie and see the status. I'm pretty sure the company could see that the shop was filled out with narratives, but they didn't care.
I've had my share of wrong date/times and locations, but those don't sting as much as the ones when you think you did them right.