Club Jitsu
From Jenny Everywhere Wiki
Club Jitsu was a “ninja club” in one universe, a night club which catered primarily to ninjas, although it did not seem against the house rules to bring guests who were not themselves ninjas. Jenny Everywhere once took Keith, Thuban and Ezri to Club Jitsu. At first, they could not see anyone else there, though Jenny assured them that there were in fact hundreds of ninjas in the room with them; they started to experience evidence of this and eventually began socialising with a few now-“visible” ninjas. (COMIC: Infinity Apartment)