I was taking an abnormal psychology course during my senior year of college and we were covering mood disorders one week. Up until then I thought I'd just been suffering from bouts of depression and anxiety but once we got to the lecture that covered bipolar I and II I remember sitting in class looking over the DSM-5 criteria and thinking "huh... this actually sounds *a lot* like me...." I ended up getting diagnosed with BP 1 a couple of months later.