My "custom" *coughing fit* Scorpion Mech. This mode on the Scorpion tank can be accessed by typing a 30 billion digit code into the driver's console. Only the most skilled Pilots are authorised knowledge of this super secret mode in the Tank. As Marines and Spartans are terrible drivers, that means you won't ever get to see one.
If you still don't get its a joke, feel free to rage in the comments.
If you still don't get its a joke, feel free to rage in the comments.