Here's something albeit in a slightly different direction. Not me, but it did happen. Your destination is Wellington NZ, light rain, nil wind. Aircraft 767. Final approach. Upon selecting landing flap, flap asymmetry warning, flaps frozen. Cannot be moved at all. Dirty go around. Checklist action gives approach speed Vref 20 + 20, about 165 knots. Runway length required is well beyond the length of the runway. Even with alternate fuel, diversion not possible as alternate fuel never assumes that the aircraft will be dirty (and limited to FL200). What could be done?