Thinking Thoughts

So if people are going to be doing all this thinking, they’re most often doing their thinking with their heads, at least according to idiom. Sometimes they’ll do the thinking with their hearts. Some people will go a littler farther and do their thinking with their bellies. There are one or two other organs that get to do thinking sometimes, but there’s still a whole universe of body parts that don’t seem to get to do any thinking done. When have you met someone who’s noted for doing his thinking with his wrist, and is it for anything besides grasping onto stuff such as jars and bolt cutters? Or how about doing his thinking with his knees, which probably marks a person who does a lot less squatting than the rest of us? Does anyone think with their fingernails? If they do, is it in favor of itching, so fingernails get to be useful for scratching purposes, or against itching so as to get a break?