Add Helvetica easter egg

A little something for this page: http://www.theguardian.com/artanddesign/2014/mar/04/helvetica-one-font-to-rule-them-all

![screen shot 2014-03-05 at 18 06 35](https://f.cloud.github.com/assets/85783/2336542/f424a752-a490-11e3-8d3f-ccb9ffa73df7.PNG)

![ ](http://media.giphy.com/media/b1ahrdq7lC3Qs/giphy.gif)