Last night’s Supper Club party, thrown by Tamsin Lonsdale at Apothéke, was really quite something — mixologist Albert Trummer blasted fireballs of absinthe into the air (not to worry — the FDNY’s “Dragon Fighters” were stationed nearby), shattered at least one glass against the wall Siberia-style, and metered stuff into beakers like he was Mr. Wizard. Our favorite moment came when he took us aside and said, “You’re good for a key.” A key? Yes, that’s right — Trummer is handing out keys to his favorite customers, so they can access the bar via an unmarked door in the adjacent apartment building. This way, you can dodge the doorman during late hours and make your entry via an underground passageway. We didn’t think this place could get any more atmospheric — it’s a former opium den! On a block where gang wars were waged! — but the subterranean entry is nothing less than Big Trouble in Little China.