I thought I was seeing things, but really I was seeing a thing. A spider.
It was crawling behind my little scanner. I got an envelope and coaxed it onto the envelope. I had the door open, ready to bring it outside, but it decided to crawl toward my hand, so I threw the envelop onto the floor. Then it started racing across my floor, so I picked up a box and dropped it on the spider. The spider survived and kept running. More box dropping. More survival. Eventual death.