8. Tickling yourself
For most people, it’s nearly impossible to tickle themselves. This is because tickling is all about the art of surprise; your brain picks up on the sensations that cause feelings of tickling and controls it before it affects you. Still, it’s not impossible; people with schizophrenic-like traits are able to tickle themselves due to their brains not realizing that the sensations are voluntary.
9. Bending your thumb backward
Some people have a double jointed thumb, also known as a “Hitchhiker’s Thumb,” which allows them to bend it backward. It isn’t painful for these people to move their thumb back and there’s no risk in hurting the thumb’s functions. The condition is caused by distal joints within the thumb. In some cases, both of a person’s thumbs can be double-jointed; in other cases, only one thumb can be moved backward.