When my wife was in college and training to be a dorm assistant, on one of their weekend training retreats the new trainees were hazed and part of it was making them play tic-tac-toe on each other's feet. It was all designed to be silly and an icebreaker, but my wife (then girlfriend) is deathly ticklish and she says it became obvious to all. They used that against her several more times during the hazing.




