It's Monday evening. It was a long day, after a big weekend. You didn't get a chance to have your coffee. You're tired, and grumpy. You're arguing on your phone with your girlfriend. The streets are busy. I'm in front of you, and I'm annoying you, because I'm not going fast enough, but you can't get past because of the people.
Finally, there's a gap. You step around me, as I stop. You grunt, clearly even more annoyed now than you were before.
Somehow, despite all those distractions and annoyances, your brain does something remarkable. Your feet stutter, and you stop too.
But you ignore the amazing thing that your brain has done without you even thinking about it, and you override it, and you start walking again.
Luckily for you, the driver I've seen racing down the street, trying to make the green light facing him before it goes away, is paying more attention than you, and with a scream of rubber on asphalt, your life carries on.
When walking around town, try being more aware of the cars - the next driver you try that trick on might have had the same day that you just had.