People who stop and talk in stairways

I'm always thrilled when I'm walking up a staircase, getting a good rhythm going, and then I run into six hundred teenage girls standing in a semicircle directly in my path. Had they invited me to this raucous game of Red Rover I might have accepted, but truthfully it's a pretty big inconvenience when I need to pass by them and their rousing conversation about
whose cell phone has the more annoying ringtone has forced them to stop and converse in the middle of the stairway.

Apparently no one told me that stairs are the new "in" social hangout.

Now get out of my way.