IWHBYD skull (Halo 3)
From Halopedia, the Halo wiki
In Halo 3, the IWHBYD (I Would Have Been Your Daddy) Skull is located on the level The Covenant (Level). For this skull, you may be on difficulty levels: Normal, Heroic, and Legendary to acquire the skull.
In order to get the IWHBYD skull, you must complete the entire mission until you reach the final battle scene, where the Prophet of Truth is planning on lighting all seven rings. Once you reach the bridge, battle your way across with the Arbiter and Flood, neutralize all Covenant, watch the cinematic, and kill all the flood. Once the bridge is devoid of enemies, you will have to literally jump through the 7 rings in a complex order. Once you have completed this, the IWHBYD skull will appear on Truth's podium.
There are two sequences that both work. One contains 18 jumps, while the other has only 7. Both will produce the IWHBYD skull, the difference between them is that one take longer. The purpose of the longer code is to provide a "backup" in case you might make a mistake or perhaps the shorter simply doesn't work.
Note: Each number corresponds to the ring you must jump through. The ring at the elevator is 1. The ring next to Truth is 7.
Sequence order:
>Shorter order: 4,6,5,4,5,3,4
>Longer order: 1,3,4,6,7,5,4,6,5,4,5,3,4,5,4,5,3,4
Once you have completed either sequence, the skull will appear at the start at the bridge at the end. The Halo theme will play as you get the skull.
The IWHBYD Skull unlocks the extra dialog in the game, which usually comes from the UNSC Marines and Elites, but some ridiculous dialogue does come from enemy forces with this skull on. For example if in a group of two Brutes one is killed, the remaining Brute has a chance to say "You killed my lover!" or such as the Flipyap quote in which one Grunt is killed and another screams "You killed Flipyap! Or Yapflip, was he... It was Yapflip... No, Flipyap was his brother. Don't tell me I don't know Flipyap! Flipyap and I went to Nipple Academy together, and, eh, now he's dead...". Other notable quotes from enemy infrantry and brutes include "I like chicked neggets!", and "Sorry, we don't take master card".
Notable IWHBYD effects from ally's and other AI/NPC's include "That one called you fat chief!" (exclaimed by sergeant johnson), "chief, can we be friends!!!" (from marines and occasionally elites), and if one trys to shoot the moniter with the IWHBYD skull activated, he will exclaim remarks such as: "That hurts my feelings, oh my God I have feelings! I'm a real boy!" "You're really pissing me off, oh my!, I did not realise I had a cussing function programmed" "Are you always a pain in the ass?"
The name of the skull is based on a statement uttered by Sergeant Johnson in the first Halo: "I would have been your daddy, but that dog beat me over the fence!". It is also seen in one of the brief cinematics that happen during Halo: CE, in which two bold black lines draw in to the screen from the top and bottom to make a 'letterbox' effect. The player still has control over the game, but the HUD is lost when the black lines appear. In the bottom right hand corner of the screen, inside the black line, it says I Would Have Been Your Daddy. These are suspected to be Master Chief's thoughts
