In my university's juggling club, two discrete camps of jugglers emerged: The "social" jugglers (partner juggling, much chatting, tricks more playful and less technical) and the "mathematical" jugglers (practicing on their own, hard technical tricks, don't talk to me). The two camps mapped quite nicely on the respective faculties as well (HUM/STEM). I always thought juggling is one of these activities that really amplifies the introvert/extrovert and people-oriented/thing-oriented personality traits. Anyway, one of the two camps was really into site swaps and the other not at all.