Scariest things said by NASA Astronauts

Astronauts are supposed to be by themselves in space, which is a frightening, overwhelming place. Therefore, it is reasonable to conclude that the likelihood of them encountering someone or something is unexpectedly low. But when they do, how are they supposed to respond?
When you see something in space, it's probably not what you expected to see because you never expect it there. What else should you anticipate when you leave your neighborhood and travel outside of your comfort zone?
Astronauts have had terrifying things happen to them while in space. Are these workplace conspiracies or actual experiences?
Let's find out!