I once sprained my ankle when I was in 8th grade. I'm very tiny so I had to sit very close to the desk because of the way my brace was. Well, I felt a sneeze coming on in the middle of class. I was sitting so close to the desk that when I sneezed, my forehead connected with the tabletop.
This happened in front of the entire class. The guy sitting across from me busted out laughing and asked, "Did you just bust your forehead on the desk?" I chose not to reply and when class was over, I realized I had a huge bump in the middle of my forehead.