As a cyclist, I've observed many things.
Squirrels are among the dumbest creatures in the World.
They can see you riding toward them, yet they'll still run across your path!
Pedestrians are the second dumbest, for the same reason!
I remember years ago, with the introduction of 'The Walkman', there was a worry that people who had loud music playing directly into their ears would lack spacial awareness. Thus leaving them a danger to themselves whilst in public.
Aside from a handful of cases, as far as I'm aware, this wasn't really the case.
However, when targeted with the same accusation, mobile phones don't come away with the same virtual innocent verdict.
Placing a mobile phone into the hands of certain individuals seems to instantly suck away at their common sense.
Sending text messages, emails, or browsing the Internet whilst walking in public, doesn't make you indestructible to oncoming vehicles.
It's not such a major issue when the vehicle is me on my bike but I've seen some crazy behaviour.
I don't know the stats but would imagine it's the cause of a rising percentage of injuries.
If they step into my path, providing I have enough time to stop, or swerve, the worst they'll experience is me screaming at the top of my voice.
I have a bell on my bike but me screaming always gets a better reaction.
I managed to make one woman scream almost as loud as I was, and drop her phone. RESULT!