Fun fact: Nic Cage's face can improve everything -- including, yes, Halo. Just don't expect things to feel as dramatic when you see Nic-Cage-Cortana talking to Nic-Cage-Master-Chief.
This mod, which replaces all textures with Nic Cage's face, is pretty hilarious -- as you can see in this video by Gunner:
The thing that happens around the three-minute mark? Too good.
Cagelo part 2 [Gunner]