Here's a rejection from a "scribbling agent," which was sent in anonymously to LROD; it's one for the books. Goes like this: No rejection letter. Just a couple of lines scrawled in ink on the folder of the book proposal.
"I'm sorry but I just didn't find this a 'must read'. Good luck elsewhere."
Says the rejected writer: "As if we don't use those folders again and again, and as if they don't cost money."