In Quake 2
, to jump in the air, with quad damage
, and fire the BFG
at the ground, in the hopes of gaining some serious altitude
Of course, the only way to survive this is with 200 red armor, a power shield (which loses its cells as the BFG fires but still helps a little) and the Auto-Doc tech. Of course, having invulnerability really helps.
See also: rocket jump