Definitely Ruler force. Run your hand down an imaginary ruler and tell the spectator to say stop. usually they say stop 3/5s of the way down. you go: thats 35 or 36 right? lets go with 36.
use the ruler "number" force so your participant must name the number between 30-40 of your choosing. I like to use 36. basically run your hand down an imaginary ruler and tell the spectator to say stop any time. usually they'll say stop 3/5 of the way. Then you can say: that's around 35 or 36...
Lol this is so funny. If he wants to see his card in the middle, best idea I’ve got is to control card second from top and cull it into the center, as he wants to see it, then cull it back up