I am a tall guy. And I have poor night vision; half the metro stations look like dark caves to me. So when some 40-something government worker drags one of these dolly bags behind them like an errant child's toy, I can trip over them. So can everyone else. Luckily, I have such poor motor control, I always look at down at my feet when I walk anyway, so I am less prone to trip than some normal person who stares straight ahead. I mean, these things just show up unexpectedly right at ankle-level. Today, I watched one woman drag one of these behind her, tripping another woman. As the second woman fell on it, the first yanked and twisted the bag out from under her and GLARED at the second woman, like how DARE you touch my BAG!
Man... if I wasn't in such a hurry to get to work, I would have told that first lady off.
I think from now on, I am going to step on them.