Or at least never done this and kept on riding. The good news is that I did not crash in traffic when it happened, and I made it about two miles home before I figured out what the dealy-o was. I did drop the chain a few times, I thought I just bent a link, but no, that ain't bent. I now have two bikes with bent or broken chains. Both relatively new chains. Crap.
If you look carefully you can see the juniper pollen on the chainring. We are beset with eye-itching-sneezing plagues of it.