Start with tickling, maybe. It induces laughter, like a good joke, and it is as physical as it can get. An interesting thing with tickling is that it is notori

Start with tickling, maybe. It induces laughter, like a good joke, and it is as physical as it can get. An interesting thing with tickling is that it is notoriously difficult if not impossible to tickle oneself. Does it suggest something on the nature of laughter and humor? I don't know. Probably that there is some social aspect to it, and a form of unpredictability.