Do you have any double joints? Do you have any talents you can do that you know others can't?
My only apparent double joint is a thumb I can redact back to my forearm when applying some pressure from the other arm. Not top arm (bicep/tricep). Just pull it back, I know a lot of people I've told that to tried and couldn't do it.
What about you? Double joints or talents that you know you have an edge on that others can't seem to do?