It's basically the two biggest spoilers of all time ("SNAPE KILLED SUMBLEDORE!" and "Rosebud was a sled.") combined into one nonsensical spoiler. Sorry for ruining it. I'm proud to say, however, that the fact that SNAPE KILLED DUMBLEDORE wasn't spoiled for me. I had to know what this "Rosebud was a sled" stuff was, so I looked it up. If anyone did a spoiler-related sig before, it may have had a similar structure...