The Silence, Dr Who, tally marks event
In the last month or so I've read about a proposal for a world wide event where we all put tally marks on our arms to generally freak out the others. Trouble is I can't find it again, or find what the date was. I think it might beĀ April 23rd which would be 2 years after the first showing of the first episode featuring the ... Any ideas?

Wait, what was I talking about?