Tickling can't be done to oneself, requiring the presence of another person, indicating the social aspect of fun. The combination of playfulness, shared experience, and imaginary interaction contribute to the enjoyment of tickling despite its slightly painful nature. The element of mystery in why tickling is fun lies in its ability to create an alternate reality that is playful and enjoyable.
Why does time fly when you’re having fun? How do you teach rats to play hide and seek? And what does all this have to do with Anne Boleyn?