Actually, there are so many ways to be an asshole (mansitting comes to mind). But this is what really bothers me, especially when trains are crowded:
Don’t hog the whole fucking pole! And you’ve come a long way, baby:
Usually, when people are doing this, they’re using their cell phones. If you’re not coordinated enough to hold onto the pole with one hand, and use the cell phone with the other, then you shouldn’t be using the cell phone.