The spectator can screw the trick because of the method.The force is very restricted and you need to
MANIPULATE their answers and sometimes ask them to change their mind until you have the answer you
want.I like Juan Pablo's trick but this is a avery weak product.Trust me,the selection of the time
will feel very ''manipulated'' and as another person said in another review if the spectators don't
change their selections the trick will be SCREWED!!!!