<< Not really. When you aren't paying attention or don't notice it you walk into it without any attempt to avoid it, thus resulting in injury. You've never seen anyone running into a immvable object while running away from the police on police chase TV? That guy had to be carried by an ambulance. >>
I know how that can be. I went out to lunch once with my uncle and a couple co-workers. After we left the restaurant while we walked through the parking lot to the cars, he flipped out his cell phone and started dialing someone. Few moments later we heard an 'OWW!' and we all swung around to see him holding his forehead while this handicapped parking signpost in front of him was literally vibrating back and forth. None of us actually saw him hit it, but he must've hit that thing pretty damn hard to make it shake like that.