A plea to all TTC riders

Today I was sitting on the subway, reading a book and minding my own business. This guy got up out from his seat and put his backback on. As he swung it over his shoulder, a metal whistle that was hanging from his backpack on a foot-long lanyard swung around and hit the metal pole just inches from my head. A few inches over, and it could have hit my face or chipped my tooth or broken my glasses or blinded me. So please, please, I beg of you, anyone who rides the TTC, look at all the things you have hanging off your backpack and think "Would this injure someone if it hit them in the face?" If it would, please put it inside your bag or at least on a shorter string of no more than four inches!