I crawled under a metal pipe, then tried to stand up in some kind of jump because I thought I passed it, whacked my head against the metal and fell on the floor.
I had a grade 2 concussion and wasn't allowed to do anything for 2 weeks except for eating and drinking (only water), sleeping, and going to the toilet (I wasn't even allowed to see any light during the first week, I had to be blindfolded when I was eating).
Yeah, I had major headaches, times that I had to throw up every 5 minutes and was bored to death, but the doctor said I almost had a skull bash so I couldn't complain.