Well tried this out. I have a friend who I play at pool and we do these types of things to each other all the time as part of the fun - so its a good enviroment for testing experiment no.1. I have to say it really does work - bugged the hell outta him everytime he missed a shot and he heard me click my fingers which enhanced the negativity more and more with each shot he missed. Then when I used it before a shot, it really did trigger him back into a poor mental state. Since we do off-putting things to each other - we are both quite conditioned to falling cues, well timed chalking, standing and moving infront of pockets..etc and it has been a long time since anything has really gotten under his skin this badly. Even he thought it quite funny 'afterwards'..lol
I was hardly subtle so now I need to test out a less noticable application to see whether it has a similar effect without detection so need to test on new subject.