It might have been a coincidence

I was sitting in the car at an intersection. There was a group of eight young people mucking around at the corner. One guy had a girl by the waist and swung her around. Some were chasing each other around, while others chatted.

They wore normal teenage clothing -- jeans, t-shirts, jumpers -- but it struck me they were all wearing the same shade of grey. It might have been a coincidence, that the eight of them were wearing white, denim blue, black and that grey. But there were no other colours.

Then I saw one of them bouncing a big yoga ball. It was the same shade of grey too.