Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
Try upgrading your browser to Google chrome (you wont regret it). There is probably an IE...
Red vs. Blue Dialouge
Level: Crow's Nest
On the "Crow's Nest" Level (Number 3) When you get your gear and heads towards the fight you see the warthog blow up and you fight with grunts you need to keep going straight to the dead end (instead of turning left to advance) and turn right to see a marine knocking on a door to have something said depending on difficulty, Its hilarious RvB.