What are some of the worst misconceptions with stuttering?

What are some of the worst misconceptions with stuttering? It's no surprise that people's impression of stutterers is often skewed, largely due to the lack of information and representation for it. Generally, if you don't know someone who stutters, you are clueless to anything about it. This leads to some...pretty annoying misconceptions that people believe. What are some of the worst ones you've heard?