I was unfortunate enough to clater my rear derailleur into my wheel last year rendering the bike unridable on a very rural road. A guy came past in a car just after, stopped and asked if I was ok, I was in the process of splitting the chain and trying to make it work as a single speed. I said "no I'm fine cheers, I'll soon get it sorted" more out of pride than anything. He said ok " I'll just wait up the top of the hill, just in case". I couldn't fix it as the chain was warped and wouldn't hold a gear. I pushed to the top of the hill where he was waiting and we loaded up the bike in the back of his car and he drove me the 6 or so miles home. A top guy! I thanked the mystery man (I only knew his first name) then also via Facebook in our club page, it turns out others knew him and my thanks got back to him again. He didn't have to help but I'm glad he did!