A toilet cover.
Often, find a sock or 2. Why??? Or maybe people dry wet socks on the back of bike rack somehow?
A burnt out van in the middle of ravine bush. Now that was creepy. It was early morning. It did look like arson. (I knew a guy, an ex-cop, who committed suicide by setting himself and car on fire. So upon seeing this several years later, it turned me cold...on a hot day. I was cycling by myself.)