Note you must have two players.

On a forge level, buy a hornet, an energy sward, and a plasma grenade.

Take the energy sward and melee the wings three times each. Then melee the cockpit two times.

Then make the other player get in the hornet, and then throw the plasma grenade on the hornet, and right after you throw the grenade, hijack the hornet.

The hornet will blow up and the other player will die, but you wont die and you'll be in the cockpit.

You can't move but you can roll down hills.