I once had a bed spring get jammed in my leg. no joke. 
The mattress was on its' last legs, but it was doing alright until that day, when I woke up with the feeling of something sharp stabbing me in the leg. I had to be very careful moving when I saw it. I just barely managed to get it out of my leg. 


The end result was a little blood running down my leg from the puncture, and a tear in my pajama leg from when the spring stabbed into my leg. I consider myself lucky I didn't need stitches in the end.