Yes, by the most stupid thing ever. My mom had a Great Dane, frigging thing was huge. I came home and went outside to pet the dog. Dog decide it was good time to get on its hind legs and lick my face. The dog seemed not to have a good grasp of distance... his head hit me in that spot on the chin as it was coming up. Didn't really blacked out, but I did see stars and tweeting birds circling my head.