How to play tricks on your friends by grabbing, thumping, squeezing, twisting or wiggling their fingers or your own. Pounding your friends' shoulders, pulling their hair, slapping their palms, and ""burning"" their wirsts are also part of the fun, and, when you're reduced to solitaire activities, you can do the ""pinky pressure"" exercise: ""If you do it right, it will hurt like anything."" For idler, there are a few bits and pieces on palm reading, shadow pictures and Indian sign language, but Blumenthal's heart is really in the feats of junior S/M--which seem to circulate adequately without adult encouragement or hard-cover publication.