What would cause this weird dream?

Almost all of my dreams are blurry and make no sence what so ever. And I almost always forget them. But I had a dream recently that was very vivid and I can remember. That night I went to bed pissed at the world and super angry. Also I was thinking about Dr. Richtofen from Nazi zombies for some odd reason. So in my dream, I walking in a dark alley or place. I remember getting attacked and getting the sh!t kicked out of me. But I wasn't in pain or scared. I was frustrated. Then out of no were I had a knife. I hacked a hacked and kept killing all these attackers. As I went I got really fancy and commandoish with my moves. I remember laughing manically close to the end. It was really gorey and tons of blood. So there is one tall guy in a dark cloak with his back to me. Hes the last one. I leap and plunge my knife squarely in his back. But he dosent budge. He turns around and its the grim reaper. He says, no matter what you do, you cant kill me. Then I wake up.
Btw, I almost always act cocky, and Im not afraid to die.
 
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