Crowded Train Grope (girls Only!) How Would You React To Being Groped?

(girls only!) How would you react to being groped? - crowded train grope

I heard a big problem groping subway in Japan, but most women do not want to make a scene, which occurs because of their culture. Assuming you're in a crowded train and you notice that someone is behind you, or you humping dry milling. How would you react? What do you think this kind of behavior?