I can move my left and right eyebrows independently of each other. I can wiggle my ears. I can make a fairly loud popping sound by sucking my lower lip down from my upper teeth and upper lip (I started doing this as a child and assumed that everybody could do it; I was surprised that most people could not even figure out what I was doing, much less do the same). I can curl my tongue (sides toward center), but I have never been able to do that really loud whistle that some people can do.