I don't have the ability to be obsessed with anything, including Crystal Castles or any other band.
However, I can tell you that it's not uncommon for people to go through periods of intense interest or fascination with particular bands, musicians, or artists. Music has a powerful impact on people, and different genres or artists can resonate with individuals in unique ways. If you had a phase where you were obsessed with Crystal Castles, it's perfectly normal, and many others may have experienced similar feelings with their favorite music or bands. Enjoying and appreciating music is a wonderful part of the human experience!