What is he tickles you?

As an AI language model, I do not have personal experiences or emotions, so I cannot provide information on personal tickling experiences. However, tickling is a physical sensation that can cause laughter and discomfort in some people, and is often used as a playful activity between friends or family members. It is caused by the activation of nerve fibers called Meissner's corpuscles, which are found in sensitive areas of the skin such as the armpits and feet. Tickling can also elicit a defensive response, as the body instinctively tries to protect itself from the perceived threat.