I knocked politely on their very obviously non-smoky door and heard laughter. So we broke it down and then searched through it as though there was actually a fire. And when they got huffy, I explained to them that we had to check each room for the fire that clearly had to exist for them to be so convinced that calling FDNY was a good option.
Basically, we turned over their apartment, I made them admit there was no fire, and then explained to them in a very subtly threatening way that if they ever saw fit to pull us from the opportunity to actually rescue people and save lives, they wouldn't be fit to ever call anyone again.