This is super easy to do, but can get some people into trouble at the tables. You have to either do it constantly or dont do it at all. Some people may go to their chips when they have a strong hand in late position and are waiting for others to act. It is one of the easier tells that I have been able to find at a table. I also find the noise of the chips soothing for some reason. I think the coolest chip trick is walking a chip across the top of your fingers, I have been working on this for a while and havent got it quite mastered yet, but hopefully one day, it looks pretty intimidating.