An injury that I vaguely remember, but my parents have told me about several times is when I stepped on a nail and almost went through my whole foot. We were getting our house roof replaced, and the workers said they would have to take 2 days to work on it. When your roof gets replaced, there are many nails involved in the process (in which many fall into the grass and can be dangerous)! After the workers had finished on the first day, me, being my 4 year old self decided to go into the backyard and play around. I just so happened to be running through the grass and stepped on a nail in the middle of my left foot. Luckily the nail was not rusted so I didn't get tetanus! My parents decided not to take me to the hospital, and my dad pulled it out and used a lot of hydrogen peroxide. I remember not being able to walk for a couple of days as it was pretty painful, so I ended up being carried everywhere!
This injury does not even come close to compare as painful as the other injuries posted. I feel quite lucky that this has been my worst injury!