Using phone handset whilst driving

I do sometimes slap the sides of cars to wake them up and make them think they have hit something.

Incidentally I do something similar but I use my handlebar.

I have a super wide steel bar on my bike, I think it exceed 60cm in width, but when I saw someone with a mobile phone in front of me in traffic, I decided to do something about it.

I cycle alongside the left side of the car, position the bar's end in front of the car mirror, about half a meter away, and then I waited keeping a firm hand on the bar..

When traffic start to move, he accelerate, wack my handlebar and got shocked thinking he hit me, since he move forward and 'hit' my bike, tried to get away but nowhere to go after going 3 metres at an alarming speed (6mph) only to be halted by another car in front of him.

• "sir if you carry on using your phone while driving, you'll risk a very large fine and possibly point on your license"*
  
  

And off I pop.