Bioshock Secret Ending

*spoilers* Okay, to get this secret ending you have to NEVER kill Sander Cohen. This means you will never be able to open the music box or get the Irony achievement. At the end of the game, after you defeat Fontaine, you will get a scene with Sander Cohen and the option to kill him then or accept his mission to kill Tenebaum. If you choose to kill Tenebaum you will get this secret ending! Enjoy!