I only indirectly caused this injury, but...

My closet has those wooden doors that fold open, right? So basically like two very skinny but heavy wooden doors with a hinge between them that fold. One of them came off the tracks. I sat it propped up against the edge of the closet door frame because I didn't have what I needed to fix it at the time.

The next morning, I wake up to the dogs playing. It was still early so I closed my eyes to go back to sleep. Next thing I hear is a loud thud, followed by something smacking me directly in the face. The dogs had bumped the closet door, knocked it over, and it landed directly onto my face in bed. Since I didn't even have my eyes open I didn't even see it coming to try to move out of the way. It's a miracle I was able to rush into the bathroom before blood starting pouring out everywhere.

So basically by not putting the closet door somewhere safer where it couldn't get knocked over (or at least somewhere to where it wouldn't fall towards me if it did), I set up a Rube Goldberg machine to break my own nose.