Several times a week a few of us take a morning bike ride 12 miles out into the countryside. Being exceptionally clever, I decided to take a shortcut through the weeds to avoid a busy intersection. This morning, while bombing through the brush, I plowed into an irrigation ditch and flew over handlebars and landed ass-over-teakettle. Of course, chemists will recognize this as an example of a cyclic endo dig.  Naturally, when something like this happens, the first thing you do is look around to see if anyone witnessed the crash.