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...
Start Regret and then proceed until you kill all of the Elites and Drones. Go outside and to your right you will see a temple without a bridge. Get up there (grenade jumping works) and go to the room at the right. Use your flashlight and go to the left corner and zoom in with your scope, you will see the hidden message "Hi Ben".