So you want to shoot a nightclub scene, or any action scene with supernatural low ambient lighting? here are some of your options...

a) you don't.
b) you use that magic green button
c) you play around with different color balance, keep your noise level down,
sacrifice sharpness and play around with your flash strength

The ones below were shot at ISO 200 with "shade" as white balance
and a slow/rear flash sync ( basically flash that fires at the end of the
exposure and superimposes a sharp image over all that handshake motion)

Aperture Priority, 2.5" with Manual Flash at about 1/4th strength,
but, with an ISO of 800 that explains the short shutter speed
and blown highlights. Though it renders cathy quite cute as a
one of those comic character drawn without a nose though,lol

Ok.- ISO was too high so I dialed down to 200.
There goes 10" of my life, and Steven's and Cathy's.
Manual flash 1/4th strength at largest aperture. Good
thing about the hand shake and motion blurring is
that it rendered a soft-ish look with hard lighting? Uber coolism.

a 6" shot. Anyone see the ghost on the lady's shoulder?

-all shots straight from camera.