Overt threat

There's this Buddhist sect called "SGI" that has a newish looking building on 15th Street, a door down from an Au Bon Pan. You can tell something is amiss just from looking at the facade. There's kind of a haunted-house feel to it, and only two signifiers give it away as a potential "House That Travolta Built": a nameplate that says SGI-USA (Soka-Gakkai International), and the above warning on the gate to the underground staircase. Which, by the way, you shouldn't go down unless you want to be eaten by a skunk.