The Elder Scrolls IV: Oblivion Tips

Dark Brotherhood
To join the Dark Brotherhood, a group of assassins, murder a random person for no reason and the game will say "Your murder has been observed by forces unknown." Then, go to sleep. A guy in a black robe will visit you. He'll ask you a couple questions. Say nice things and he will tell you to kill someone. Kill them and go to sleep again. He will visit you again and let you into the Dark Brotherhood.