I have done it a few times on accident when I was awake.
The time that sticks in my head the most is when I was pregnant with my daughter. I stood up, and felt funny (pregnant...go figure
) and I looked back at me sitting on the edge of the bed.
I turned and saw a lion walk in the door, and freaked out and tumbled under the bed, holding my stomach to protect my daughter. i remember seeing the silver cord flinging wildly, and it slapped me back in my body...very scary