Another one too make them wonder:
http://www.youtube.com/watch?v=sFEfmbAeEDY&ob=av3e
When you are in a complete rage:
http://www.youtube.com/watch?v=_ehy2JhRmME&feature=fvst
And the ultimate in intimidation (Warning: Not for the Faint of Heart)
http://www.youtube.com/watch?v=dsKO_r76kfQ