I know that I am old-fashioned, but I find it slightly disturbing that there is this outstanding talk showing vulnerabilities of the German power grid, and on the other side they seem to encourage exactly this kind of attacks on the power infrastructure in the opening ceremony ( <a href="https://media.ccc.de/v/38c3-opening-ceremony#t=1140" rel="nofollow">https://media.ccc.de/v/38c3-opening-ceremony#t=1140</a> ).