(Aside: I can't remember ever seeing a Ninetynine show that didn't rock. I remember seeing them once many years ago and not paying much attention, other than "hmmm, vibraphones and toy keyboards.. interesting", but that's because I went there to see The Paradise Motel (IMHO, perhaps the greatest Melbourne band ever), and because I didn't really "get" the indie/garage-band/casiopunk aesthetic back then. And/or because their style has evolved a lot since then.)
Then the Night Terrors, whose CD launch this was, came on. A screen was set up behind the stage, and films were projected onto it (one of the first was Un Chien Andalou, and a lot of the audience weren't expecting the eye-slicing scene at the start). Fluorescent lights were placed against the back walls of the stage, and switched on and off during the performance, adding an eerie, backlit effect to the guy playing the theremin. In one word, the performance was electric.
Afterwards, Cameron Ninetynine took on DJing duties and entertained the remaining people with his rather odd record collection. (He seems to have a thing for that Star Wars disco theme piece.)
When in doubt, go with the dada.