I would say that the most dangerous thing I've ever done is to get an open water diving license abroad when I couldn't even swim. Pushed by my friends, the four of us went to Thailand for a diving course. The course was quite speeded-up(rushed/ fast-paced). We needed to finish all theory classes and swimming pool tests in just one day. From the second day we were "thrown" into the open sea for practice. It may be not that challenging for a skilled swimmer, but I was kind of scared to death because I couldn't swim then. Also, I didn't think this through carefully and realized that one coach needed to teach two students at the same time. Everyday I struggled with whether to give up or not, because I thought blind boldness was not a good thing to stick to, but at the same time I wanted to make it (wanted to step) out of my comfort zone. Finally, I (completed the course and) got the license. I felt excited, and I learned to swim after I came back home.