I was just trying to clean up, because I thought it would help me feel better. There was a knife out in the kitchen, and I picked it up and tried to put it away in the knife block - one of those wooden blocks meant to hold knives of all different shapes and sizes. As I pushed the knife in, I met more resistance than I had expected. I thought it even made some high-pitched noise as I pushed it in, but maybe that was just my imagination. Maybe I had put the knife in at the wrong angle, or maybe there was some kind of debris stuck in it.