What did I find in a lawn????

I was walking barefoot on a lawn and suddenly it did not feel right in my foot. I looked down and checked why it was uncomfortable under my foot...and what did I find!? I mean really!? A coloured pin (knappnål in Swedish) was stuck straight into my foot! You could only see the round colour on the top of it. Oh Great! Just typical! I pulled it out and cursed the person who was so stupid to throw a pin on to a lawn.