competition: what was the last nightmare you had ?

I have so many terrifying dreams, I can't remember my last one, but I will tell you about my reoccurring nightmare, that I have at least twice a year.
I am in a stairwell and there are numerous staircases going up, I have to get to the roof in order to be safe (Or at least that's what I assume, I have never made it up to the roof). As I begin my ascent through this stair maze, I hear laughing behind me. I look back and I see this huge clown, covered in blood, holding a huge knife. He begins to chase after me, as I run faster up the stairs, continuously looking back at this terrifying clown, he grabs my ankle as I see the rooftop door.....
At that point, I always wake up.
I have never been able to finish that dream and I have had it more than 12 times.