I got a rejection letter for "Evidence" from somewhere I had forgotten I had submitted it to. That's like the reverse of a forgotten present. I also got a 24 hour rejection letter, actually, more like a five-hour rejection letter from an agent. Which makes me wonder if they have no slushpile, a really efficient staff, or aren't even reading their cold queries.
Another annoying policy is the "If you don't here from us in two weeks, we aren't interested" approach. I've gotten one-sentence rejection letters, and they are preferable to assuming the group I've submitted to is perfectly efficient and will always get to every query in two weeks. It's easier for me and easier for them to just send out the stupid rejection letter, I'd think.