Sometimes when I walk down a long hallway or a long stretch of sidewalk, I try to walk with my eyes closed for a long time. It's like playing chicken with myself. I usually try to see how far or how long I can walk without freaking out about tripping or running into something (I don't recommend doing this on a crosswalk).
It's not so dangerous on a sidewalk. The worse thing that can happen is the occasional person seeing me from afar off and wondering why my eyes are closed. But it's quite dangerous in a long hallway. Because there's a chance that someone will come around a corner (who breathes quietly and doesn't wear squeaky shoes) and I'll walk right at them. And that almost happened yesterday. I was playing personal chicken in the hallway, and I opened my eyes about 5 feet from where I was going to open a door. But to my surprise there was a man standing directly in front of me, looking at me like I was insane. So, standing in the middle of the hallway like an idiot, I jumped about three feet in the air and inhaled sharply (snorted).
So the guy probably thought I fell asleep while walking and he jolted me awake. And I prefer someone thinking that over someone knowing that I play chicken with myself in a hallway.