Stop and think
I saw a cell phone version of this yesterday. I was walking over to Andy and Becka's, and crossed the street at a four-way stop in front of a guy talking on his cell phone. I expected to hear him go as soon as I had passed in front of him, at the very least by the time I reached the other sidewalk. I glanced back, and he was still just sitting there, blithely gabbing away on his phone, cars lining up behind him. Sometimes "stop and think" can be a problem, especially when it's "stop and yak." :-)