What was the worst nightmare you ever had?

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Recently I had my worst nightmare,something like in the movie 'shutter'. In my dream,something was sitting on my shoulder then I screamed but no voice came out from my mouth. I was so scared but no one seemed to notice that I was attacked by a ghost. I just kept on shaking my shoulder trying very hard to get rid of the ghost.It was really a scary nightmare for me. After I screamed for sometimes, I woke up suddenly. What a relief for me,luckily it was just a dream. What was your worst nightmare? More scary than mine? Please drop your responses here to share with me.