i was having a conversation with my therapist while i was still in therapy and i expressed that i was having a bad day and she asked me why i explained that a snippet of a song was stuck in my head and i couldnt get it out i didnt know the name of the song and i didnt know the artist i didnt even know if it was real or something that i made up  needless to say the fact that it was ruining my day was one of the markers for my ocd diagnosis