Missing Middle Knuckles
Unlike some of the other features on this list, not having middle knuckles on your fingers would probably be pretty easy for people to spot. That’s what this person has or doesn’t have, and they said that it’s actually a hereditary condition. Hopefully, it doesn’t affect their day-to-day too much.
However, we imagine that some things would probably be a bit more difficult to do without middle-knuckle joints. This guy also said that his toes are also missing joints, although that would probably be less of an issue than missing joints on your fingers since most people don’t use their feet to grab things.