How to hit a toddler on the chin

Whilst walking home from work one day, I was minding my own business, on a city path when I felt my foot hit something hard and small.

A small stone went flying away from my foot, right in the direction of a wee toddler, hit his little designer trainers that probably cost more than my coat, bounced up and hit his chin.

Luckily the mum never saw me kicking the stone, and I quickly walked past whilst the mum attended to her crying toddler with a sore chin and the evidence lying conspiciously on the ground.