Our summer backpacking trip in Swedish Lapland last year was such a case. Originally we had planned a circular route starting from Kvikkjokk via Padjelanta and Sarek National Parks. However, we never made it as we encountered an impassable stream which forced us to backtrack. It was still early in the season and water levels were high.
The disappointment was great but in the end the trek back was quite relaxed and we had lots of time to enjoy the beautiful scenery. We fondly remember our adventure, although we had different plans originally.
The following video is a summary of our adventure: