The day before, I thought a man in the boat ahead had made a mistake, getting a lock ready for him without noticing that we were on the way and when he saw us, he reversed his manoevre. Actually he was going the same way as us and seemed to be trying to help by opening the paddle for us before heading on. He had done one side and walked forward to the next lock. I did the other once we got there. It seemed to be taking a while to be ready. Then I saw that the paddle at the other end hadn't been closed so it was taking twice as long. Some mistakes are a disaster and some just slow you down a bit or cause a little bump.