TonyB wrote:Sign Language is great. It's a system for telling someone what their star sign is. It can even be used on a nudist's beach, though the closest I have come is a hot tub.
There are numerous variations to this kind of routine, two featured in Mind, Myth & Magic and of course the original "What's My Sign" routine.
Eddie Burke has some very cool Astrology themed routines that you may want to look into as well.
Paul Bell mentioned Palmist and if one is moving along the Mentalism course of things, I fully second this Numerology and being familiar with Webster's Psychometry from A-Z as empowering foundation tools. Especially if you are going to do any kind of Astrology demo; you have to be able to deliver a sound Reading if you dabble in said areas.
Another related skill that can be quite fun is to learn how to do Magic Squares. They can be very amusing if you have a gift for gab. Look up my buddy Jon Stetson's web site and check out his video highlights and you'll see just a small example of how they play.
Memory Stunts are another neat angle you can work with but they do involve a good deal of advance study and practice (there's more to them than "tricks"). But doing a demo of the Human Calculator and the idea of having a near photographic memory are a dynamite course of action for anyone that likes Mentalism but wants to step away from the more mystical elements. Same goes with Graphology.
I mentioned skill sets earlier, one that I've only recently gotten serious on is Pencil Reading... sort of. You can do yourself a bit favor when it comes to this skill by ordering Matthew Mellow's TECHNIQUE from Paper Crane Productions. What he shares simplifies the how one learns to use the essence of this particular skill-concept; Matthew's variation making it a bit more "Obvious" to the performer and still hidden when it comes to public scrutiny and for that matter, observation by most magic buffs. Though I have given some serious critique towards Paper Crane and some of its "ethics" (seems they don't like to give credit where its' due), the thinking by their various contributors, is general sound and even "progressive" to some degree.