We often collect superstitions throughout our lives without really questioning where they came from. When something is passed down from our parents and our parents' parents, it becomes culturally ingrained. For instance, even if you don't consider yourself superstitious, you might still knock on wood out of habit, or have a dislike for black cats!
Let's take a look at the origin stories of some of the most common superstitions around the world. If you weren't superstitious before, you might be now... Click through the gallery to get started.