1) I was in San Francisco and needed to change my return flight back to London to a week later. But I could not because it was a non-changeable ticket. To fly a week later I would have had to purchase a new ticket, which I declined to do. So I boarded my original return flight as usual. There was a delay due a problem with refuelling the plane. After two hours we were asked to leave the plane. As it was getting late some people were going to miss their connections in London and would have to overnight at Heathrow. Hence we were given the option to rebook, even if we did not have a connection. Great, my non-changeable ticket, became changeable. I got my extra week in San Francisco without paying anything extra to the airline.
2) Another time I was on an overnight Amtrak train from Seattle to Emeryville the station for San Francisco. We prepaid for accommodation on the train which included meals. The train was due to arrive into Emeryville early morning. We had nothing planned on the morning of our arrival into San Francisco and I was worried that the hotel would probably not allow us to check into our room so early in the day. During the night our train was delayed over five hours due to a derailment of a freight train in front of us on the single line track. We got a restful night’s sleep as the train was stopped a lot, got to see some scenery we would not normally have seen in the morning and got an extra lunch free of charge on the train. Finally arriving at the hotel in the afternoon, so there was no issue with obtaining our room on arrival.