Once i forgot the time while hiking. The sun came down, the way back was too long and then there was no light anymore. i didnt had a cellphone to call somebody, so i got into the forest, where i tried to found some sleep, it was very dark and had a bit of a horror-movie.
But everything was fine next morning. I woke up, walked out of the forest and was traveling home. It was a nice Experience, not really dangerous, but still nice.