Being double jointed is something that can completely freak people out, and even terrify them. Their eyes are unwilling to believe what they are seeing. Some people believe that being double jointed, or having hypermobility syndrome, means you have twice the number of joints; that is not the case. Being double jointed simply means that your joints, ligaments and tendons are much more flexible than most peoples. So how does one become double jointed you may ask? The depth of a bones socket ( where the bone sits) determines a persons flexibility for that joint. People who are double jointed have a very shallow socket allowing them to move their joints freely, and even being able to completely dislocate the bone from its socket without any pain at all! Scientist say that we have all been double jointed at some point in our lives. As we age, our ligaments harden, loosing much of their flexibility.