The sound of children singing alone can be quite scary (see the Poltergeist main theme, or the "1-2 Freddy's coming for you" song from A Nightmare on Elm Street), but when coupled with certain weird and creepy nursery rhymes, the shudder factor rises exponentially. Let's take a closer look at some of these disturbing nursery rhymes, and perhaps you'll think twice before teaching them to your kids.