Open the "Sandtrap" map in Forge mode. Find one of the two large vehicles located at either end of the map. They are known as Elephants or Rhinos. Using the forge, place fusion coils against one of the longer sides of the vehicle. You can place them down the entire side and/or stack them on top of each other. Enter back into player form and back up a substantial distance (as to not die when then coils explode). Shoot one of the coils, which will cause a large explosion, flipping the large vehicle over. Walk up to it. A message will appear saying "Press RB to, wait... how'd you do that?"

This is a comical change from the standard "Press RB to flip the Warthog, Ghost, etc."

Special thanks to Clay Gow