World's most accurate pie chart

While Tufte argues (convincingly IMHO) against pie charts, this one was sent to me by fellow scientist Andreas and I love it. He stated: “finally statistics I understand" – fishing of course. So I tried to elucidate the source. The oldest I found so far is at reddit submitted by Jushooter. So credit to him!

At reddit you can also peruse a number of  witty comments debating whether this picture is really up to snuff with regard to the “most accurate” property ☺.