Broken Glass

This morning while Karen was in the kitchen making something for breakfast and I heard a crash and I was sitting in the livingroom. She yelled for me to come out to the kitchen and she told me what happened and then showed me. A glass that was setting behind other cups by the strainer lifted up, went over to the sink and slammed down into the sink and broke. I asked her if she was sure the glass didn't slide and she said no and showed me where it was setting and what it did.