A bar in Antharia was the headquarters of the Antharia Jack Appreciation Society (still in operation during the Great Monster Uprising), one of the creepiest of his fan clubs. They were always going on, pretending to be Jack and trying to get impressionable young adventurers to go and steal memorabilia for them--a hat from Jack, his whip, etc. Outsiders were warned that unless the particular Jack had a huge TV-star trailer and a team of make-up artists following him, anyone who claimed to be Antharia Jack was lying.

SOURCE(S): Legends of Zork