My friend, Jack, had a crash yesterday. I was not riding with him, but it happened when he was with a crazy invitation only group he rides with, that he invited me to join. I saw this when I got a flurry of emails from the group's list. I guess he did an endo on some poorly maintained road in Weston and was knocked out for a minute or so. The police were called, and although there were no obvious injuries, they took him into Boston, to MA General. He got sent home after they checked him out.
It kind of freaked me out, as he rides almost everyday and was a hard core commuter before he retired. But, he doesn't pay attention that well, and i suspect this group was not going slowly! He seems fine, but I admonished him to rest. Hopefully, his wife will enforce this.