No one ever really knows what someone else is going through in their own lives. Everyone is different, and everyone's struggles, accomplishments, vices, and weaknesses are different. Especially when people meet later in life, there is a whole unknown history behind a person. People can be weird, but some are experts at hiding their pasts, or their current problems. Some people seem really unsuspecting on the outside, only to be totally messed up.

It's a bit jarring to find something out about a person that seems totally out of the ordinary for them. It's also kind of creepy, especially depending on what they're doing, and how close someone is to a person. Many people have discovered something odd about a friend before, but some of these discoveries are unhinged.

Here, people shared what creepy discovery they made about a person who seemed friendly and totally normal on the outside. There are some pretty shocking stories here.