Y'all, just now?  Coming out of the lab?  The door bounced off of the reservoir for the air conditioner (HVAC system in this building is not sufficient for a lab with 2 fume hoods and an autoclave, so we have a window unit in the wall) and hit me in the head.  Hard.  I saw stars.  Now I have a lump and a red mark on my forehead.  Ow!