Knife stuck in back

Would you know if a 6" knife was in your back?

A man by the name of Yury Lyalin of Moscow Russia had been out drinking with friends after work, went home and everything was good. Then the next day, Yury went over to get some breakfast out of the fridge when his wife noticed the handle of a knife sticking out of his back. (not the one shown) He apparently did not notice the 6" knife in his back when he went to sleep and still didn't notice it when he had awaken the next morning. He was rushed to the hospital and the knife was removed leaving no damage to vital organs. Even though Yury did not think much of it, prosecutors are looking to possibly charge one of his drinking buddies with a crime that could lock him up for up to 8 years in prison.