Skul: The Hero Slayer

Here's a video on how to do this, but if you need a written walkthrough:

1. Play through the game until you stumble upon thorn bushes with thorns on them.
2. Jump onto/into the thorns, and die to them.
*The ones on the ground/in a pit would be easy, as you can just sit there*

If you haven't unlocked it already, this will also get you the achievement "The Legend Begins". Be careful, as this will reset your area, and bring you back to the castle.