Unicycles New York Unicycle Club is about "having fun with a good bunch of people, on unicycles."
Dorothy Parker "If all the girls who attended the Yale prom were laid end to end, I wouldn't be a bit surprised" — just one of many choice turns of phrase by the great Parker. Fellow devotees can be found at the Dorothy Parker Society of NY.
Globetrotting It isn't enough to have trotted the globe to be part of the Circumnavigators Club, founded in 1902. You need to have circumnavigated it.
Pipe Smoking The New York Pipe Club has just introduced their own NYC tobacco blends, including Hell's Kitchen and Bedloe's Island, which they encourage you to stick in your pipe and smoke it.
Vegetarian Scrabble You can join here. You may not, however, use the word Tofutti.
Witchcraft The 759 current members of the New York City Witches Meetup Group, run by Lady Morgana, encourages the free expression of all things witch, Wiccan, and Pagan.
Psychic Phenomena Telepathy, clairvoyance, precognition, psychokinesis, and other psychic phenomena are studied at the Psychic Explorers Club. And there's also the The NYC Paranormal Meetup.