My Merkur 33c has an annoying habit of tending to unscrew itself if I don't cinch it down tightly after a blade change. Well, this morning I learned not to make that mistake again. Usually, I notice right away when I haven't screwed it back together tightly as the head will start to rotate when I place it against my face. Apparently, I was half asleep this morning because I didn't notice it was loose until I dragged the razor across my neck. The blade was not seated tightly so it acted like an adjustable that was opened way up. I took a huge chunk of skin off my neck right next to my Adam's Apple. I think I'll take a day off from shaving tomorrow. 
