This morning as I walked to work in East Perth I noticed a young man looking down at his mobile phone as he walked - nothing too unusual - but then he stopped suddenly on the pathway for a moment before carrying on.

As he walked passed me we caught each other's eye and he smiled at me sheepishly. After that glance, I knew what he was up to.

He was one of thousands of Perth people wandering the streets playing Pokemon GO on their smart phones after being swept up in the global craze.

And he's not the only one I've spotted engulfed in the game's virtual reality - if you keep your eyes peeled, particularly when you're in the CBD, they're everywhere - so much so, confused people are even calling the police on them.