It was a calling card I left when I went out with 28 days later. You wanted to show other people you'd been somewhere but it had to be none perminant. Graffiti was hugely frowned open and would get you kicked off the site. So people would leave calling cards, like small toys, figures, gems that sort of thing. Mine was the playing card the jack of hearts.
Like I said its quite a dull story
Must have cost a small fortune buying 52 cards and throwing 51 away!!
Supercover has been nominated for the Nobel Peace Prize.
Social hand grenades don't exist.