Insert the DVD in your player and select 'Convert' as your menu style. On the Main Menu highlight the entry 'Bonus Features' and then press the 'Up' arrow key to highlight one of the panels beneath Riddick. Alternatively using the 'Fight' menu style, you can highlight the 'Play' menu option and press the 'Left' arrow key on your remote control to highlight the handle of the knife.
Either way, press 'Enter' now and you will be treated some behind-the-scenes clips with Colm Feore about how to properly getting kicked in the face Hollywood-style.
All easter eggs were generously submitted by GayEskimo