Uh, a bed blanket.
"It all started one night when went to bed, when the blanket was tight. I woke up in the morning thinking it was just a dream, but in the morning, my entire body was numb. I looked down to find my body turned into a blanket. I went to class in a jacket, when I went home I tripped and my entire body flattened out. I was terrified. I decided to take a nap. When I woke up I found that i was on top of someone. I screamed. Or, I tried to scream. As I'm writing this, don't trust the blanket. My hands are flattening...."