threads die all the time, and are generally not brought back once people have said their piece; it's rare for a thread that isn't about sex to even get this far really. but, you did bring something new to the conversation with the which finger question. i use the pointer much more than any other, although pinky is good for getting into those hard to reach corners, and the thumb is often the best way to handle a booger hanging right on the tip of the nose (this type seems to appear most often when suffering from a cold).
absolutely. what an interesting observation. its not a coincidence, but a evolutionary measure imo. you gotta keep the air ways open.