Here is an interesting comparison of Cortana over the course of the 4 halo games:
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Hologram T-bag Egg
Level: Any Multiplayer Map
In multiplayer with the equipped Hologram Armor Ability, once you kill your enemy you can send out a hologram to the enemy's dead body and your hologram will T-Bag the enemy's dead body. It's a humorous egg that 343 Industries has done to the game to take the Halo spirit and to really put it in the game (No Kidding). In the video below you can watch a demonstration on how this egg can be preformed. Also mentioned, this is a great distraction to use if you want to aggravate you enemy and or create bait by T-Bagging the enemy body with a hologram. Happy War-games!