You know how it's not possible to tickle yourself?
Well, some freaky (or bored) scientists actually decided to do something about it!
They set up a test based on the theory that we can't tickle ourselves because the brain negates any sensation caused by its own movements.
Dr. George Van Doorn and several colleagues created a body-swap illusion by setting up 23 test subjects and measured their potential for self-tickling.
According to the BPS Research Digest, the experiment was set up like so: